The chain ring is attached to your crank so the big circle your chain goes round that is attached to your pedals. There should be 5 round bolts on this which you can tighten yourself easily with a allen key and a screwdriver - good luck!
@Clara started
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The chain ring is attached to your crank so the big circle your chain goes round that is attached to your pedals. There should be 5 round bolts on this which you can tighten yourself easily with a allen key and a screwdriver - good luck!