It's very easy to add a text link. Here's how you do it:
1. Double-click on any word (or several words) which you would like to turn into a link.
2. In the link menu, choose where this link would send your visitor: to another block, another page, or another website.
3. Choose Open in a new tab if desired.
4. Click Submit to confirm the changes.
You can get more details about various types of links in this tutorial.