A few of us have had some trouble adding links so I thought I'd post a How To Step by Step....
Firstly open (in a new tab) the page you want to link and COPY the address
Then whilst in edit mode TYPE in www.yourlink.com
Highlight the link you just typed in and CLICK the ADD Link symbol at the top of the POST box (next to the ADD Photo)
This will bring up a ADD Link box, this is where you PASTE the link you copied before
Then when you are done click Add Discussion/Event/Save as normal and check that the link works.