The very very very unfortunate thing is, I've NEVER used IC2. I don't understand the things and most guides about it is pretty outdated since IC2 is an old mod.
Ahh I see. I must admit, videos tend to be my guide to these things at the moment. But give it a look!
To make steel with it, you need a heat source - the electric heater, ideally, from IC2 with between 1 and 10 coils inside - you want the most possible, as that makes it need more power but work faster. This will have a coppery square on one side, that's the heat output.
Sit your IC2 blast furnace on top of that and the same coppery square on the BF (the heat input in this case) should be facing towards the square on the heater - it can be wrenched if not (I think it's a shift left click to make the relevant side face away from the side you click on, double check that).
With 10 coils, it will take 100 EU/t I believe, so you want a decent power source going into your heater. If you've got ethanol, and the Forestry mod, I recommend bio-generators.
Lastly you'll need compressed air cells going into the blast furnace and empty cells being removed. To make the cell, put an empty IC2 cell into a compresser. EnderIO will work well for automated removal and replacement of cells into the blast furnace I imagine.