Type "@" to link to any page including tabs and alias
Page: Welcome
Tab: Welcome
Alias: Landing Page
Or highlight the text you want to link and either click the plus icon to create a new page for the text or the page with an arrow icon to link it to an already existing page.

Type "/subpage" for a table of contents to all subpages (can be added to the sidebar as well)
Or drag pages from the left-hand column onto the page you want them to appear. This includes inside tables, layout cells, callouts, etc.
Type the text you want linked on the page.
Highlight it and select the link icon.
Copy the URL to where you want the link directed.
Click the linked text and insert the URL. EXAMPLE - Note: It'll only show a preview if it's linked within the same project.
You can also just past the URL on the page if you don't need to link specific text: https://www.patreon.com/c/DevenRueWriter
NOTE: While editing, you cannot simply click a link to open it in a browser. You will need to copy and paste it manually.