1. Go advanced.
2. Click on the insert link icon ( the one with the earth )
3. Put in your link
4. After you copy and paste in your link and press ok, There will be a prat already highlighted, delete that and write something else, for example "kfjdsakjfhakjhdf "
Or you can just copy and paste your link into the textbox and press post reply, but the steps above is just so if you want it to say anything you want.