Rev, we
cannot delete forums, even if we are asked to do it.
If you want it deleted as soon as possible:
Delete all forums, posts, user accounts, and sections, and log out from the Admin Panel. Then there will only be a message saying This Board has no Forums (or something to that effect).
No one can post on it, and it will be locked, and eventually deleted, after some 21 days.
Meanwhile, if you want to open another forum on ForumUp
now, you have two options:

Use another email account for registering the forum. Then you can open a new forum on the .com domain.

Use the same email, but open the new forum on another domain -- there are a few "neutral" ones to choose from, like .org etc, in addition to the country domains. The only actual difference between the domains is that they are on different servers.
FoxLeonard