Adding hyperlinks to your story is simple with the rich text editor. Just highlight the text you want to hyperlink. The toolbar will appear automatically; then, you can click the link  symbol.  

When the link tab opens, you can copy/paste or enter the URL. You are also able to click out to view the URL, as well as update the Link Text from this modal.

You'll also notice two options in this drop-down menu: Open in New Tab, and Affiliate Link .