What can be done after signing

What can be done after signing

I was wondering how do you change an email signature to an in person signature if possible after documents have already been signed by other signers? I know you can change it before documents are signed however if someone does want to switch it to in person is that possible? The option to update that field is greyed out currently and I'm not able to make any corrections due to at least one party signing however I can make edits.