When you sign up for an account with Logistimatics, either by purchasing a tracker or a subscription from the Logistimatics website, you will select a username that will be associated with your account.
You cannot change the username for an account once the account is created. You can change the Display Name by going to https://logistimatics.com/my-account/edit-account/. The display name will be the name shown on reviews you leave and in some other areas of the website.