Hi there Beryl and welcome
Can you tell me please the issue you have adding the BT account in mail?
Or you have no idea how and need instructions on how to do this?
Can you go to www.teamviewer.com
Click on Download in the middle of the page
Download and install the program and give me the ID and Password ***** please so I can connect
Do not close the program but leave it open else I will not be able to connect