It is not possible to change your Flippa username without intervention from the Flippa Customer Success team.
In general, we do not allow customers to change their Flippa username, however from time to time, we make exceptions in special circumstances.
If you have a very new account or an account with a near flawless record, feel free to contact Flippa's Customer Success team with your request. Please specify why you would like your username changed and what you would like it to be and we will come back to you with a decision.
Please also keep in mind that if the change is authorized, we can only make one change so be sure to pick something worth keeping.