How do I mount my bike on roof rack.?

I have a Specialized Enduro. The front does not seem to have a quick release, but the back does. The roof rack requires you to take off the front wheel. I have tried taking off the rear wheel and it wont fit. How else would I do this? Would I have to buy a big mouth Thule rack so the whole bike just fits on top?|||yea the big mouth would work but that will cost you right? is there nuts holding on the tire? you may have to take along a wrench to take the wheel off then put it back on when you get to yourdestination. that is wierd that there is not a quick release tho. good luck