One-time donation

I see the problem, yes.
The "create" form gives preset recurring options and no way to remove them.
When I remove them directly in config, then the form doesn't submit properly.
This is gonna take someone a couple of hours to sort out.

Now I looked properly.
The way to make a one-time donation option on the form is to set the frequency to 0.
I've added a note at the bottom of the widget.