How do I sign a contract before sending it to the other party?

I have created a contract that requires my signature and the customer's. How do I sign it before sending it to them?

I'm not quite sure if I understand your question correctly.
Do you want to add your signature in a submitted form? Or do you want to show it in your form when it's filled by your users, like a pre-signed contract?

There are some widgets that you can use to sign a form, but I'm not sure when do you want to sign it. If you want to do this after the form is submitted, you would need to add the widget on your form and then edit the submission to include your signature in it. If you want to do it before the form is submitted then you could add an image of your scanned signature on the form.

I hope this helps.
If you need further assistance, please let us know.