@bk69HOW TO DO THIS
As Keet noted, the @___ link at the top of reply postings is a link to the posting which was replied to; just right-click and [copy link location]. As Gauthier noted, the grey replies line at the bottom of a post are similar links to the replies themselves.
You can manually copy-paste text into your reply from another post, then select it and hit the [Quote] button to offset it on grey.
You can type in the @___ link name, then select it and click the [link] button then paste the link URL you got earlier. You can't get the same font as the true links, as can be seen in Gauthier's post. If it's the first post you want a link to, you can use the up-arrow [top] link for the URL.
To get a link to another posting (one which was posted with the [Reply to topic] link at the bottom of the page), the easiest thing to do is to generate a reply (no need for any content), refresh to get the reply on screen, copy the link URL, then delete the just-generated empty reply. If you do this, you'll need to have the reply you're building copied elsewhere first (doing the refresh will discard your partially-built reply); easiest for that is open the thread in another tab to grab the URL (right click on the up arrow, then [open in a new tab]). Another way is to use one of the above methods on an arbitrary post, then edit the post number in the link in your reply (the #po123456 number). To find the post number for any post, click-and-drag from the middle of the post author name up slightly, then right-click on the highlighted part of the author name and [view selection source]; in the source there should be a highlighted line like
< div class="post-wrap" id="pd125355">< a id="po125355">< /a>
You can use these techniques to add links to other threads as well, if you need to tie in from somewhere else (e.g., like this).
ETA: the < a id="xxxxx"> is standard HTML to identify a location on a webpage, and the trailing #xxxxx on a link is standard to go to that location.
