Image didn’t work so here is what I have: (edited)

I need to build this character table for an assignment but honestly I have no clue where to go from here. I tried looking at the rules given to us in our notes but I’m so confused. I get most of symmetry but the way my prof introduced character tables left me dumbfounded. The D2h character table has so many more irreducible representatives than I am ready to solve for and don’t even know where to start with that...any help?