Before you can use digital signatures, you must have Adobe configured and your certificate included. 

Security settings for digital signature with TCS-Geant/Sectigo certificates: https://tickets.tu-dresden.de/otrs/public.pl?Action=PublicFAQZoom;ItemID=946


Install personal certificate in Adobe: https://tickets.tu-dresden.de/otrs/public.pl?Action=PublicFAQZoom;ItemID=948


 

1. Open the document you want to sign in Adobe. Then click "Tools" in the upper left corner.
    

   

   
    
2. Select "Use a certificate".
    

   

   
    
3. Now select "Digitally sign" from the toolbar.
    

   

   
    
4. Drag a rectangle at the point where you want the signature.
    

   

   
    
5. Select your certificate from the list and click "Next".
    

   

   
    
6. Enter the certificate's password when prompted. Otherwise, click on "Sign".
    

   

   
    
7. Assign a new file name and save the document.
    

   

   
    
8. Below the toolbar, you can see the validity of the signed document.