Editable unsubscribe text

I am trying to set up an automatic email gift acknowledgement. Using the template you have, I made one that works for us but the locked section with organization information and unsubscribe language is confusing. The text says that the donor is receiving this email because of an online form submission. However, with automatic receipting, it may be that I want to send this after someone sends in a check and I enter that gift. I would like to edit the text to make it more generic.