Editing after submitted

Hello i have a salon and need to make sure that the documents our customers sign and agree to can not be edited or changed after they’ve submitted their agreement. 
please help me. 
I sent it to my other emails and it appears I can edit my signature etc 

You can conditionally disable them using the "Get form page URL" widget.

The condition should be like this:
If "Get form page URL" contains "edit" then disable the signature widget.

Please give it a try and let us know how it goes.

By the way, if you don't want the user to edit their submission, simply delete the {edit_link} in your autoresponder email so that they will not have access to their submission.

Guide: How-to-Edit-the-Email-Template-for-Notifications-and-Autoresponders