@gonefishin generally speaking, Now don't allow the use of 3rd party routers with their service. They can be connected but you'll need to be relatively savvy with the process.
Having used the search function at the top and Google, I can't find any instructions related to that brand of router and Now Broadband. There are some matches on the Sky community so maybe try there (Sky and Now are the same network). Below is a link to someone who has outlined what your router needs to function with Now.