HOW TO FIX MY BIKE!!!!!!!!!!!!!!!!!!!!!!!?

I WAS TRYING TO UNTANGLE MY BIKE AND USALLY IM GOOD IT IT BUT I CANT SEEMS TO UNTANGLE MY IKE. I REALLY WANT TO RIDE IT TO LOSE WEIGHT. HOW CAN I BREAK IT SO I CAN PUT A NEW ONE ON IT IM 12 AND MY DAD WONT HELP ME. THX I CAN DO IT MY SELF THO
Update: THE CHANGE.OR IN OTHER WORD THE TOOL THAT MAKED UR BIKE MOVE WHEN U PADDLE
Update 2: I MEANT CHAIN
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