Here is some code that may help you. With it, you can get a regular button such as the buttons below the "Quick Reply" box on this page.
Code:
<a href="http://www.google.com" STYLE="text-decoration: none"><input type="button" value="Caption"></a>
Just replace the link to Google with the URL of the page you want to link to and the Caption with what you want the button to say. Make sure to leave these in quotes. Enjoy!