The Steam interface is not the most intuitive ever created, that's for sure! I asked this in another thread, but are you "subscribed" to the Game Guru discussion/forum/whatever it's called? I'm sure I had to do something like that before I could post. I've had the Steam client for about 2 1/2 yrs and I still get lost in it, although I just play the games, I don't actually do anything else there!
MAME Cab PC: i7 4770@3.4Ghz (passmark 9945), 12GB RAM, Win 8.1/64, GeForce GTX645 (passmark 1898); Shiny new laptop: i7 4800MQ@2.7Ghz (passmark 8586), 16GB RAM, Win 8.1/64, GeForce GTX870M (passmark 3598); Old laptop: i5@2.3Ghz, 8GB RAM, Win 7/64, Intel 3000 graphics