After you have signed up, it would be great if you could take less than one minute to edit your profile name to your xbox gamer tag. To do this, you simply click 'profile' which is usually on the top right hand side of the page.
Once you see this, you will have the option to click edit under the circle avatar picture, simply update and save. Attached pic below for reference.
This would make life so much easier for me and the staff when updating.