Hi Graham,
If your studio lights have some kind of input connector, usually a mini or standard jack plug and your Hahnel receiver has an output socket, probably a mini jack plug, all you need to do is attach it to one of the lights with a suitable cable (one might have come with your triggers or you will have to buy one). Then, presuming your lights have them, activate the optical slave cells. Now, fit the Hahnel transmitter to your hotshoe, switch everything on and take a picture; the transmitter will trigger the receiver activating the light it is attached to and the flash from that will trigger the other lights via their optical slave cells.
Hope that makes sense!
Tracey