Please read the following information carefully:
On Fandom, we allow users to rename their account once. Before making an account rename request, make sure that the new name is the one you’re sure you’ll want to use on Fandom.
Renaming can be done through our rename form. Once the form is submitted, the rename will be final and you won't be able to change your name again.
You can then log back into Fandom using your new username. Your password will remain the same.
You can find the form here.