1. There is a green checkmark on this signature, indicating that this signature file exists on the machine. Just sign it clearly by email, and the signature box left after it is clear can be deleted by menu tools, advanced editing tools and selection tools.

2. This signature is an exclamation point, indicating that there is no such signature file on the machine. Then you can only ask for the invitation to sign this file to sign it, and delete the signature after importing it into the computer.