A PDF-Version can be found at the end
Creating a digital signature (ID) for internal PDF documents (For the programs Adobe Acrobat Reader DC and Adobe Creator)
Create a self-signed digital ID
1. In Adobe Acrobat Reader or Creator, click the Edit menu and choose Preferences -> Signatures.
2. On the right, click More for Identities & Trusted Certificates.
3. Select Digital IDs on the left, and then click die Add ID button 
.
4. Select the option " A new digital ID I want to create now", and click Next.
5. Specify where to store the digital ID, and click Next.
Stores the digital ID information in a file, which has the extension .pfx in Windows and .p12 in macOS. You can use the files interchangeably between the operating systems. If you move a file from one operating system to another, Acrobat still recognizes it.
Windows Certificate Store (Windows only)
Stores the digital ID to a common location from where other Windows applications can also retrieve it.
6. Do the following:
6.1 Type your name, email address, and other personal information for your digital ID. When you certify or sign a document, the name appears in the Signatures panel and in the Signatures field.
6.2 Choose an option from the Key Algorithm menu. The 
option offers more security than 1024-bit RSA, but 1024-bit RSA is more universally compatible.
6.3 From the Use Digital ID for menu, choose whether you want to use the digital ID for signatures, data encryption, or both.
6.4 Click Next.
7. Do the following:
7.1 Type a password for the digital ID file. For each keystroke, the password strength meter evaluates your password and indicates the password strength using color patterns. Reconfirm your password.
7.2 The digital ID file is stored at the default location as shown in the File Name field. If you want to save it somewhere else, click Browse and choose the location.
Please select the following path as save location:
7.3 Click finish.
If a digital ID file with the same name exists, you're prompted to replace it. Click OK to replace, or browse and select a different location to store the file.
Note:
Make a 
of your digital ID file. If your digital ID file is lost or corrupted, or if you forget your password, you cannot use that profile to add signatures.
Register a digital ID
To use your digital ID, register your ID with Acrobat Reader or Creator.
1. In Acrobat, click the Edit menu and choose Preferences -> Signatures. In Identities & Trusted Certificates, click More.
2. Select Digital IDs on the left.
3. Click the Add ID button 
.
4. Choose one of the following options:
Select this option of you obtained a digital ID as an electronic file. Follow the prompts to select the digital ID file, type your password, and add the digital ID to the list.
A Roaming Digital ID Stored On A Server
Select this option to use a digital ID that's stored on a signing server. When prompted, type the server name and URL where the roaming ID is located.
A Device Connected To This Computer
Select this option if you have a security token or hardware token connected to your computer.
5. Click Next, and follow the onscreen instructions to register your digital ID.
Specify the default digital ID
To avoid being prompted to select a digital ID each time you sign or certify a PDF, you can select a default digital ID.
1. In Acrobat Reader or Creator, click the Edit menu and choose Preferences -> Signatures. In Identities & Trusted Certificates, click More.
2. Click Digital IDs on the left, and then select the digital ID you want to use as the default.
3. Click the Usage Options button 
, and choose a task for which you want the digital ID as the default. To specify the digital ID as the default for two tasks, click the Usage Options button again and select a second option.
A check mark appears before the selected options. If you select only the signing option, the Sign Icon 
appears next to the digital ID. If you select only the Encryption option, the Lock Icon 
appears. If you select only the certifying option, of if you select the Signing and Certifying options, the Blue Ribbon icon 
appears.
Note:
To clear a default digital ID, repeat these steps, and deselect the usage options you selected.
Save handwritten signature and insert it into the digital ID (For the programs Adobe Acrobat Reader and Adobe Creator)
1. First, please sign carefully on a medium size white sheet of paper, ideally in black or dark blue.
2. Open file e.g. in Word, cut the signature to size, then save it as PDF-File in
3. In the document to be signed, click with the left mouse button on the blue fillable signature field. Now select the desired digital ID for signing and click on "Continue".
4. Now click on "Create" at the top right of the window.
5. Click on "Image" at the top center of the window and then on the right side of the middle of the window on "Browse".
6. Select the previously saved PDF-File of your own signature and click on open.
7. Now the handwritten signature is inserted into the digital ID.
8. Under "Include text" (see image under point 5), you can now select which data should be displayed in the digital ID. Then click on save and the insertion of the handwritten signature in the digital ID is finished.