[header] How to fix a broken bicycle chain [title] Take a picture, draw out, or memorize how the chain is currently attached. [step] Note how it moves in and out of the pulley wheels, if there are any. Chains wrap around the derailleur (shifting device in the back of the bike) in a particular, but not difficulty to understand, patter you'll need to replicate later. 
Some chains are simply threaded on the gear. [substeps] If you work carefully you won't even need to remove the chain from the bike.