I just got an Action Replay for my birthday. I mainly got it for Animal Crossing and Pokemon, and I'm wondering how to do that Text-to-Item hex?

I feel really dumb asking, but I gotta ask if I'm gonna figure this out.

I've googled it and there's a bunch of codes. I found the hex list, complete with most of the items, but I don't know how to get them to work.

Help please?