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.