1. Switch to the tab that is the page you want to link to.
2. Go to commands > show current position
3. Copy the URL that is displayed (select & ctrl+c or cmd+c)
4. create or open a text or HTML tool on the page you want to link from.
5. write the text: "go to next page" or the name of the next chapter.
6. select the text with your mouse
7. click the chain icon
8. paste the URL in the box (ctrl+v or cmd+v)