Selecting all of one word and replacing it

How would I make all of one word in the code (using notepad++) a different word? For instance, if you have the word “fish” in a .lua file, and you highlight it, it will turn the word “fish” everywhere in the code green. I want to know if I am able to change the word “fish” to a different word, without having to go through and do one at a time.

Edit>Replace All
Don’t use Notepad++ but it should have that

I don’t see it. Does anyone else know how?

Downloaded it, Search>Replace
Type in “Fish” in the first box and the word you want to replace it with in the second box. Then press “Replace All”

You are t3h g0d of 1337ness.

Or press Ctrl + H.