When you type a post, your text box will have a banner. Look for the 'insert link' button (looks a bit like a chain link). Click on it. You get a box pop up with two fields where you can type in. The top field says 'URL' paste the 'site address' / link in there, i.e. the http of your workshop thread. The second field says 'text'. Put any words you like in there, i.e. 'here'. Then click insert. The finish your post as normal.
Am I making sense? (I'm having one of those linguistically challenged days.)