You will have to arrange with Tiscali to change your password, and then you can sign in with the new one. On their website they have a phone number specifically for changing passwords, and in my experience answer quite quickly.
Surface Pro (2017) vs Surface Pro 4
Where HTML5 is headed next
MacBook Pro v Surface Pro 5
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.