Highlight the url in your address line.
Press control c.
Come to this thread and on your post click edit.
Highlight your Wheaten/Blue Wheaten Ameraucana then where you can change your font, size, add smileys, ..., there is a button with the earth with a chain over it. Click this.
Your curser should be in a field after URL.
Hit Control v.
You are now back to your edit window.
That should do it for you.