"To create a username" means to come up with a unique name or nickname that you will use to identify yourself when using a website, app, or online service.
Sentences with «to create a username»
To buy bitcoin you must first set up an account by creating a username and password. (bitcoinafrica.io)
After creating a username and new password, borrowers will have unlimited access to log into their account. (studentloans.net)
More so when creating your username or signup with an email address. (articlesfactory.com)