Schwinn Spinner Comp My Spinning Bike Makes A Loud Clicking Sound When I Pedal It. How Do I Fix This -- Or Who Can I Get To Fix It?

My spinning bike makes a loud clicking sound when I pedal it. How do I fix this -- or who can I get to fix it? - schwinn spinner comp

Three months ago I bought a bicycle Schwinn Spinner Pro Spinning in Craigslist. I click for about 2 months before the start of his strong, if you enjoyed the pedal.

Who knows what could be the problem - and how can I solve this problem?

If not, who would be able to solve this problem? Since I bought used to it, I did not repair or service information. (I live in the Chicago area.)