Hi @begbie67 and welcome.
Sorry you're having problems activating the App. Are you getting any error messages? Can you post a screen shot of what you're seeing? Can you give us as much detail as possible and we'll try to help.
If you've got your MyBT set up then we'll need to take a closer look at this @begbie67. Can you please drop me over an email with your details? You'll get the contact the moderators link in my profile.