If the user is to sign documentation, the user should have his/her signature scanned and added to their user.
In Settings, you find the user under Contacts & Users. At the bottom of personalia section, there is a field for «Signature». Just right of the Signature text, there is a blue symbol. When you click this symbol, you will access a PDF describing how to add signature.
Print this PDF, and have the user sign according to rules listed on PDF. Scan the document, and use Snipping Tool (or similar tools) to extract the signature as an image file. When this image file is uploaded as signature, the signature will be added to documentation created by the user.