Next time, please edit your post instead of double posting.
I don't think you understand hex editing. You're mixing up hex editing and the memory of the ROM. Hex editing just takes the ROM (or any file if you're using an external hex editor) and displays it in hex. Which you can then edit to change things. The memory of a ROM changes real-time with the ROM itself, either depending on what you do, or how the ROM acts.
What you're trying to use won't work. If you want to give yourself more rupees in Zelda, with the memory viewer you have to find a memory address whose value is equivalent to the amount of rupees you have, then get one rupee, and see if the value changes by one.
You can read more about this here.
http://tasvideos.org/MemorySearch.html
If this is an Action Replay code, FCEU and FCEUX doesn't support Action Replay. Even if you did convert it to a Game Genie code, it's not allowed in a TAS, if that's what you're making.