Still struggling to connect to the internet with a new router. I am with Onestream, what ISP should I pick on the drop down list? I thought BT VDSL as it is apparently through Openreach, but no luck.

We have had Onestream fibre for a year, and have recently got ourselves a new router, the Archer AC1200. I can't seem to get this connected to the internet. i am able to access therouter though. I tho