Ajevo hi, renaming a forum is not officially supported by FreeFlarum, but I can do it if you create a new forum with your desired name and I will love the data from the old forum to the new one - then you can remove the old forum. This will also keep your donation status (I’ll manually add it to the new forum)
I will need to know the old and the new name of the forum, after you create the new one - you can either reply to this thread, or e-mail it to info@freeflarum.com, if private.