Throughout the Guide creation process, you'll see windows and options for 'tags', very much like you would see on social media platforms. It's a good idea to think up how people might search for your Guide topic and create tags accordingly.
First, click on the Guide Navigation Bar "Settings" cog wheel and click on "General Settings".
A pop-up window will open that allows you to change the name and description of your Guide. Look for the "Tags" entry bar and, one at a time, enter the tags that best describe your Guide. Click on "Update" and you're done!