Hi my name is ***** ***** I will be the expert working with you today to help and resolve the problem you have posted.
Outime does not allow to change the username once created you can change or update email or phone number for security purpose however you cannot change the user name.
The only workaround is you can cancel the account the account which has your real name as a username and once you get a notification on your email that the account has been deactivated after that you can create a new user id and you may have to wait for a day or two to use the same email address or else it will not allow you to use it on the same day if you want to create a new user id.
Alternate is you can create a new email on outlook.com, Gmail or any one you prefer and then you can create a new user id on ourtime.
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