ETA: ninja’ed by @What_Exit. In greater detail …
Go to the OP of that thread. Click the chain link icon at the bottom of that post. Then click the copy button on the popup, and paste the resulting link into your post here, and ideally into your OP while you’re first writing it. Although it’s now too late to edit your OP.
Which link I’ve just put here:
Which also has the result of putting a link to this thread / post into the footer of that thread’s OP.