Write String in BIOS!

Recommended by Wim's BIOS...

I want to write a string(or string) in bios(system bios) (between e000:0000 or f000:ffff).
How can I do this?

thanks advance

1) Use a eeprom programmer to get a copy of the code or bios flasher to get a copy of the code.

2) Use a hex editor to find the offset/code to change/add and make the modification.

3) Burn a new eeprom, install and test.