How to change username on profile is impossible to find. Please advise.
you cannot change the user name !!
Usernames can not be changed once an account is registered. When an account is registered on Fiverr, a username is required to complete the registration. Your username is unique and is associated with your Fiverr orders, Gigs, and ratings.
If you want a different username, see Closing Your Account.
Note: If you close your account and open a new account, you must use a different email address.