To automate adding tags to incoming posts, let's add rules in the Auto-tagging section. Add a new auto-tag, name it and choose an existing tag. You can use up to 10 keywords to define when the tag is added to an incoming post. Keywords can use * in place of a character or at the beginning or end of a word in order to take advantage of more options.
You can set up multiple auto-tags to see how they are automatically added to new posts. You should create a new auto-tag instead of renaming an old one to keep the reporting correct.