A SRAM Powerlink means you can connect a chain without tools. It's easiest to do this on the bike if you have a 'C' shaped wire hook to connect the chain together. It's easy to make one of these from a broken spoke. A Sram Powerlink looks replaces one outer link of chain. Prepare the chain 1/2 an inch short with an inside link at each end.
Connect the ends of the chain using the ‘C’ hook.
Insert half the SRAM Powerlink into each end of the chain.
Line up the pins with the bigger part of the ‘keyhole’ in the other half of the SRAM Powerlink.
Connect SRAM Powerlink
Push the pins into the keyhole then pull the two ends of the chain apart to close the SRAM Powerlink .