As far as i can see, the ???????34 bit is your username for which you signed up with with BTinternet. I don't think its possible to change your username easily unless you sign up again with a new account with BT internet.
OnePlus 5T review: Hands-on
Illustrator Andrés Lozano on his improv line work, brazen use of colours & hand sketching
iPhone X review
Comment envoyer gratuitement des gros fichiers ?