Trying to put a URL/Link in notice - not showing up

[Sawa Dee SohL]

It states you can use URL / Links in the notice:

You may include the following special variables in the HTML:
{userid}, {username}, {musername}, {sessionurl}

However I'm guessing I'm not putting my link in right. I've tried to set it up the following ways:

[sessionurl=http://Example.com/forum/showthread.php?t=1055] Click here [/sessionurl]

{sessionurl=http://Example.com/forum/showthread.php?t=1055} Click here {/sessionurl}

Sorry, not to good with Html so if it's a dumb mistake, Im' sorry for wasting a topic.

Basically I'm trying to make a link in the notice, to go to a topic on my forum.