mIRC doesn't support html style links, ie: <a href="www.site.com/page.html">Visit my cool site</a>. You can post a link www.site.com/page.html
, and it will be clickable in mIRC, but you can't make other text link to a site. The best you could do is something like this:
<newsbot> Headline: "mIRC is the best IRC program in the world!" Story: www.mirc.com/get.html
The link at the end would be clickable, nothing else would be.