Step one: Make a Steam account. If you already have one, ignore this step. Step two: Click "Games" in the top-left. Not "Library", but "Games". Step three: Click "Add non-steam game..." Step four: Select Minecraft. Or something. Step five: Enjoy!
What I do is use it to talk to my steam friends without switching to different tabs. Also, I change the name to "Project Borealis" and watch all of the noobs who think it's Half-Life 3 alpha testing.
Hahaha, I might actually try that. My favorite alias for it was "Burrito Simulator 2013." People would ask me about it and I would say that the "guacamole level is really difficult."
I disagree, I think that the Pick-Up-The-Burrito-And-Put-It-On-A-Small-Plate-Level-Which-Is-A-Really-Long-Name-For-A-Level level is the hardest