The red button features work slightly differently if on Freeview, Sky and Cable. On Freeview you have less options available, two at most. At the moment on Freeview Red button should bring up an option saying Press Select for F1 Forum and then there are two more options for F1 Forum and Highlights. On Sky and probably the same on Cable, users have the multiscreen option as there are more channels available, so the menu will vary.
If you cant be bothered with al lthat on Freeview just go to channel 301 for the Forum and 302 for race highlights