Should you wish to change your Username, you will need to submit your request to Wikia's Tech Support via Special:Contact. It is really important that when you tell them what you want your new Username to be, that you ensure that there are no typos and that uppercase and lowercases are correct as what you submit will be exactlly how your new Username will appear (Wikia Staff are not mind readers and will not be able to know if you meant something else). Please keep in mind, that usernames cannot begin with a lowercase letter.