| It depends on the chain type and bike type. Is this a derailer setup or single speed. Does the chain have a master link? Is this a shimano chain? You can consider getting a new chain which is probably overdue anyway which is likely why it broke. If this is a multigear system the chain is probably stretched out and you should replace it to avoid damaging the chain rings on the cassette.
If it's a cheap bike and chain and you really don't want to just buy a new chain get a master link from the bike shop. If you want to put the pin back in you need a chain tool which you can get at any bike shop and a massive amount of patience to get it right.
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