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I'm sure you find informations in the datasheet. And usually the manufacturer provides some sample code and/or application notes about reading/writing EEPROM.
Please read those informations. Andi n case there still exist questions, so please post a detailed description of the problem.
See Section 6 of the datasheet, and the FRM document Section 5 (make sure you get the correct section for your device).
As for the NVKEY unlock sequence, if you are using the XC16 compiler then check out the User Guide for the __builtin_write_NVKEY built-in macros that let you do the assembler sequence from C (it is important not to try to do this sequence using equivalent C code as the compiler can rearrange the instructions and insert other code into the sequence - it MUST execute as the specific instruction sequence which the __builtin_xxx macros do for you).
Susan
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