A channel insert is usually a Tip-Ring-Sleeve (or TRS) connection, which means you need to use a special cable with it. This cable will have a TRS (or "stereo") plug on the end that goes into the composer pro, and two separate TS (tip-sleeve, or "mono") plugs on the other end. You need to read your Q10 manual to figure out which connection (tip or sleeve) is IN and which is OUT, then connect the other ends of the cable to the composer pro according to those instructions. Or you could just try it, speak into the mic and see which connections work.
Plugging your mic straight into the composer will get you nowhere fast.
A whole Behringer-related post and I didn't rip on Behringer once!