Download Nokia PC Suite
http://www.nokiausa.com/get-support-and-software/product-support/nokia-5130-xpressmusic
connect via cable or bluetooth
PC SUITE explains everything pretty much.
btw: If it is a TMOBILE 5310, you are very disabled.
It would be YOUR choice, but look into the possibility of flashing with the actual NOKIA software. You get soooo much more versatility. You can install free programs from the internet, etc. I love my nokia 5310 now that I flashed with nokia firmware. Email me if you are interested and need help doing so.
Good Luck!