Release Of Liability Letter What Legal Form Would I Use For The Following?

What legal form would I use for the following? - release of liability letter

"I will give the refund, which in turn I ask a notary
Document signed by you, release me from any legal action or anything. "

If one of the liability of a "sharing?" I wonder if I can download a template, instead of a lawyeresque from scratch?

But, no one here for free write this letter.

It is also the subject of a refund. How can I understand that in the long run? Thank you!