From the website screen, navigate to Content, then Navigation tab. Click Create and enter the name (this will be what shows on your site) and URL. If you're adding a link to an existing DPG page, you only need to put in the path, which is the last part of the URL such as /gallery/.
When you create a page in DPG it will automatically be added to the navigation, unless you choose otherwise in Advanced Options on the new page dialog. When you delete a page it will also remove navigation items which point to it.
When creating links to external sites you should always include the http:// or https:// prefix. For internal links always point to just the part after the domain for example /gallery/.
From the website screen, navigate to Content, then Navigation tab. Pick up the item by clicking down on the ☰ icon and drag to its new position.
Deleting an item
From the website screen, navigate to Content, then Navigation tab. Click the 𝖷 icon to delete an item.