Quick Guide for Mac

1. Select the piece of text you want to link;

2. Click Link on the toolbar;

3. Choose the link destination: Page or URL or Email; 

4. Or select the text and right click, choose Tool Mode -> Link, or Annotate -> Link, then choose the link destination: Page or URL or Email;

5. Or click Tools on the main menu -> Note Type -> Link.
The blank area can also be linked as mentioned steps above.