You already know how to create an Auto-moderatation rule (see here), but it's also worth knowing that you can edit it whenever you want.
You'll be surprised at how user-friendly the process is.
Go to the "Auto-moderation" module in the menu on the left. You will see all the rules created so far. Select "Edit."
Whatever changes you need to make.... go ahead. Whether it's a keyword or an action in Inbox.
Don't forget to save the changes and.... that's it.