Now, you are going to add your pretty link to the others in the above box

To do this, you click on the link icon at the top of the text box as you see below, where the red square box is

That opens the box to the left of it marked 1. In this box enter your pretty link

In the box called Link Text marked 2 write the text you want to have. In my case I wrote YouTube

Exactly as the Picture below shows

Once this is done click update at the bottom and then the Text Widget to the right will show your new link, in text form.

Click Save at the bottom of the text widget box

On the next step, you will learn how to make sure your link is showing as you want it to