Can you provide more info? Specifically, can you give a diagram showing the outputs of your breakout board and the inputs to the driver board that has you concerned?
From a quick look at the schematic that you provided, it looks like the circuit wants to see an enable input, a step/clock input, a direction input, and ground from the breakout board.
Doesn't your breakout board provide those outputs?
If you don't have an enable output from the BOB, you should be able to hard-wire an enable connection on the driver board (I didn't stare at it long enough to decide whether you would need to ground it or just leave it floating - it looks like there are pull-up resistors on the inputs, so that if they are left unconnected then they will have a logic "high" asserted on those pins).