It's the very first level. You have to find a little lift, which takes you above that place, and press a switch. Lots of Stormies will then come, so be prepared... The switch turns the machine on, and then you have a little puzzle of getting the right patterns on the screens, by pressing buttons, which change little bits of the symbol. Refer back to your "Tab" screen (I think). The bit which is Inventory, Mission Stuff, etc. I remember being stuck for ages on the 'splody bridge bit.