magicWord variable

I’m trying to figure out a way to activate the magicword variable. I’ve reviewed the old conversation chain and it does not provide the following:
1) location of where the code should be added. I believe in the Code Snippets? Could you confirm?
2) I tried adding the code to the code snippets and typed “su” (after changing the magicword variable to “su”) and nothing occured on the site. Is there something else that needs to be entered prior to the magic word?