For increased discoverability and for accessibility it is essential that as soon as you are ready to publish a guide you make sure to add a custom URL for the guide and for each subpage (tab).
To Add/Edit the URL for the entire guide select the guide in LibApps and then click on the edit symbol (the little pencil) next to the URL
To Add/Edit the URL for each subpage go to the page you wish to edit and then click on the edit symbol (the little pencil) next to the Page URL