I don't really get any premiums, but I have Epix through Blockbuster. That shows on my guide and if I go directly to one channel. Apparently, you can only see the channels you subscribe to in the guide. I have it on the "All" setting. If you are subscribed to the premiums, I don't know why they wouldn't show.
If I click on the Movies or Shows tabs at the top, I can see offerings from the premiums which I can't watch if I don't subscribe to those channels. Maybe you want to try that.