Hi there and welcome
To remove it, when your in the account, click on the blue circle in the top right and click Sign out.
This will sign it out from your computer, removing it.
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.
Else let me know please how you go