Hi again.

I recommend calling in to support so they can do a screen share and walk you through how to edit these templates as well as see what could be causing you to not create a new one. As for creating a new receipt template that is one of the options in QuickBooks Online that you can use. In the same template section when you click New just select Sales Receipt so you can start making a new one.

If you have any questions let us know and we'd be happy to help.