How does the next paragraph end?

How to fix a broken bicycle chain
Take a picture, draw out, or memorize how the chain is currently attached.
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. If you work carefully you won't even need to remove the chain from the bike.