I'm getting an error:
Error: A form with this name already exists but is not associated with the Maestro form design.
Even though I change the name of my form, I can't build it.
Where should I be renaming my form, so that it is unique?
I found that if you "Build with Options" (from the build dropdown), that you can rename your form so that it doesn't clash.
You have another form in the same TM organisation with the same name. If you delete that, you will be able to build yours.