Diane, the software is a little strange with the links. You do have to type (or paste) it into the text, then highlight the text, and then click “link” in the menu bar.
https://driskellcenter.umd.edu/
The benefit of this method is that you can have a regular text without showing the URL. So for example, I could write, “Go visit this great website!” By highlighting the word “website” then clicking “link” and then filling in the URL in the popup box, I embedded the link to HNA’s website without spelling it out.