Like many tattoos a chain tattoo can mean many different things, but generally speaking most chains represent life. The chain links show our own personal time line, and everything that we keep locked up inside. Other interpretations can represent a persons moral code or the fate.
For girls placement is popular around the ankle or wrist, and lots of women like to add things like charms, keys, or jewelry to their design. The chain color is also something you should consider, most are done in silver or gold, but you could easily choose something unique to make it your own.
These flexible alignments of fitted links can make profound statements about who you are and what you represent. It's said that girls with things to gain will often get chains, so ink on these reins and enjoy.