I've found a manual for the charger that should help you out -
http://www.heliguy.com/i/ImaxB6manual.pdfI'm fairly certain I've got the same charger, so here goes:
Plug both cables on the battery in. The LiPo should have the balance cable, which is the white wide one that has 1-5 pin holes on it. This one plus in to the right side of the charger. Then plug in the deans end (the end that you plug your gun into).
Get it turned on, and hit the "Batt Type" button (far left) untill you reach the LiPo type. Once that's up, hit "Enter" (far right button).
From there, you can choose the rate at which you can charge your battery. The digit on the bottom left should be flashing, and if it isn't, hit "Enter" again. Choose the rate to charge at by pressing the forward and back buttons (middle left and middle right). I think a good rate to charge that battery at would be about .6, but I may be wrong on that.
Once you choose your rate, hold the enter button untill it starts to check the battery. It will give you two numbers, and if those numbers match, hit enter again to begin charging.