No it is 8 bits, a number like 0x12 is just an 8 bit number.
To split up the number it depends on how it is stored, with MyTags[5] assuming it is a char array then just
EPROMaddress = MyTag[0]
EEPROM address + 1 = MyTag[1]
And so on. Only you use the EEPROM write function.
Have you looked at the code in that project? There is a function that does this.