SeamusG, in the row of buttons above the reply box is one that says "Link". Click that and add the link in the URL box and the words you wish to link in the "URL Name" box.

If you're using the WYSIWYG version, just highlight the text you wish to link, then click the link button and add the URL.

BTW, I'll give myself a shameless plug and announce that there is now a link on the main Magazine page that hass ALL of my How-To articles on one page. (Although, right now the "Got Smoke" article is missing)