Study the chapter called "Data EEPROM Memory" in your datasheet. Tells you all about it, and the sequence of commands necessary to read and write the EEPROM. It describes the registers involved and even has some simple asm code to demo how to do it.
Don't panic cuz it's assembly language! You should really know a little asm at this point anyway. Read the code and see what registers they're using and what they're writing to them.