Some courses require submitted files to be signed with a digital signature, and no you don't need a robot to do it for you.
How to create a digital signature can vary depending on the device and PDF reader you are using.
Click on the signature field and select a digital ID or 'configure Digital ID'. If you don't have a digital ID, create one following the instructions in your PDF Reader.
This article from Adobe provides some helpful instructions: What are digital signatures?
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