So first you click on the blue Link button
Then the dialogue box comes up:
Then you type or copy and paste the address that you want the link to go to in the second box (Web Address). This case I put in Tonya's blog address :
Go to the top box and clear out the address that was automatically populated there(we are going to put in something else) :
Then you want to put in some nifty words for the link ('cause the link address is not as cute) you put these in the top box that you just cleared. I wrote Tonya's Totally Awesome Amazing Blog:
Click OK and you have your "clickable" link:
I hope this helps. Let me know if there is anything else I can help with.