Here's the manual, en pdf , to download...
Magic_Q.pdf
Chapter 3.2 deals with the Test procedure (page 19 of the document, page 54 of the pdf file...). In short, you affect the Magic sliders to a DMX channel each (it matters not what fixture in your case; I'd recommend twenty PAR cans...). That will make each slider correspond to the equivalent channels of the bar (I'm assuming it's connected and switched on, right..?). Channel 1 (Slider 1...) affects the way the bar is to work, and should be at zero for manual operation. Channel 2 is the overall brightness; I'd set that to about half at first. Channel 3 is for strobe speed; leave it at zero for now. Channel 4, 7, 10 and 13 set the Red brilliance for each set of Red LEDs; Channels 5 etc... and 6 etc... do the same for the Green and Blue LEDs. Get those working first and you'll be on to a Good Start. Don't panic, and go in little steps. If there's a display on the bar, it should, I think, show 'Colo' if it's in 'Manual' mode. Any help..?