You have to type:

<a href="linked address">Label</a>

where 'linked address' is the address of the page your link goes to, and 'Label' is the underlined text that appears in the browser for the user to click.

For example, if you typed:

Thanks for your comments on "<a
href="http://www.renderosity.com/mod/gallery/index.php?image_id=1314459">These
Days</a>"

you'd get the following:

Thanks for your comments on "These Days"

Hope that helps