If the link you want to promote is an affiliate link
, you may want to convert it to a shorter URL so it doesn't look so awful. You can use sites like "make short link" to shorten the link.
If the link you are promoting is your own website or blog, leave it the way it is. The viewer will see the name of your website and may click on it.
You can also create a clip at the end of your video instruction the viewer to click on the link to the right of the video. Many people don't know to look there.