To add a new page to your guide, click the plus sign (+) box at the bottom of the left column. You can either create a new page, or you can reuse a page that already exists on another guide.
If you would like the new page to appear as a subpage, use the Position dropdown to assign the new page under an existing top-level page. Remember: If you want to be able to edit a page that you're reusing, you must check the "Copy" box.
You can create a friendly URL for each page in a guide just as you can for the guide itself by clicking the pencil icon next to Page URL.
To delete a page or subpage, click the Page button at the top of the page, followed by Delete Page. You will be prompted to choose which page or subpage you wish to delete.
Caution: Once delete a page, there is no way to recover it. So make sure you choose the right page!
You can change the order of the pages in your guide, or even make top-level pages subpages and vice versa.
To reorder or move a page or subpage, click the Page button and, under Reorder / Move, choose Pages. From here, you can change the order of top-level pages and subpages in your guide.