You have to use an HTML link tag. For example you would put: (a href="URL GOES HERE") text you want to be a link (/a)
But you have to change the ")"s to the greater than sign and the "("s to a less than sign . (the answer box wouldn't let me put it in there the way it's supposed to be because it doesn't allow HTML code)
That will make whatever is in between the two tags be a link to the URL specified in the quotes after the href= part.