Note You can say “Xbox, go to settings” from any screen, but you’ll need a controller once you’re on the Settings screen.
Scroll to the right. Under OTHER PEOPLE,select Remove accounts.
Select the account that you want to remove, and then select Choose this person.
Select Remove from this Xbox to confirm.
When you’re finished, select Close.
Can I remove my account from someone else’s console?
If you no longer have access to the console, you won’t be able to remove the account remotely. However, you can change your account password, which will disable the access to your profile on the other console. Here's how:
If your account is on someone else’s Xbox 360 console, go to Xbox 360 Profile Protection. There, you can sign out of Xbox Live on all Xbox 360 consoles and require a fresh profile download on all Xbox 360 consoles.