It looks like the problem is a few people are used to creating links with BBCode, which lets you just select a word, press a button, and pop in a URL for it.

Our forum uses HTML to create links, so it's a little bit different. When you highlight a word and click the link button it will automatically wrap your word with this:

<a href="WORD">WORD</a>

You need to replace whatever is in between the quotes with your actual URL. Ex:

<a href="http://www.google.com/">WORD</a&gt;

And that creates a working link. WORD