Hey there, Carol Ann Jenkins
Please can you click onto the search bar on your taskbar
Then search 'Xbox'
You will then see a search result appear on your screen. At the top, should be the Xbox app. Please click onto 'Open'
This will load up the Xbox app on your computer. If you haven't opened it before, it may ask you to sign in. However, if you have signed into your account on Windows then it should sign you in to that account automatically.
Once it has opened, please click onto your name on the top-left of the app
Then click onto 'Sign out' if you are not signed into the right account.
This will then get the app to sign out of your account. Once it signs out, it will ask you to sign back in again. Please enter the previous Microsoft account you used for Xbox.
Hope this helps,
Nathan