Just started playing and I keep buying equipment that shows as incompatible, thus reducing my power output. it's quite annoying and a cash waster... how do you tell if you can equip something or not before purchase?
If you used the /restart miner command, and you haven't yet changed any of your equipment, then what you have right now are Cruise Disruptors, not conventional missiles.
I think those are fired with the E key. Or at least, that's what I have them mapped to. I'm not sure if that's the default for them, though.