I'll see if I can do this on the new board and give a step-by-step instructions.

1. Click on "Switch to Full Reply Screen."

2. Once you are in full reply screen mode, click on the icon that is "create a link to a webpage." It looks like a little globe, and it is the second icon from the left.

3. A window should pop up that says "Enter the complete URL for the link you wish to add." (That's what mine says; I use Internet Explorer. Not sure if it'd be different in Firefox)

4. Paste your link's URL (address) into the box here and hit OK.

5. A second window should pop up immediately that says "Now enter the title of the webpage you are linking to." Create a name for the page. As an example, I created the Art in Madrid link to a New York Times article about Spanish banks supporting art in Madrid museums. Art in Madrid

Hopefully this makes sense for you!