how can I setup my Roku stick so I can see my fios tv channels?
You will not get every channel on the Roku but after you plug the Roku in and you are up and running you select the individual channels you are subscribed to. It will need your Verizon Fios credentials and if accepted you should be able to view the channel or channels. It does not always work.
for better information use Roku assistance from their web page.