For those of us trying to point to a posting in the middle of a thread, we can perform a little "magic"...
(without having to bring up the individual post to reach the "thread" link Vic discussed)
(1) at the post you're trying to highlight right-click on the post number (such as the "41" on Vic's last post).
(2) from the menu that appears, choose (FireFox) "copy link location" or (IntExplorer) "copy shortcut" or (Edge) "copy link"
(3) either paste that directly into your message, or into the box that the "globe with chain link" icon
presents.
(4) If you use the icon, you'll see something like
[URL="https://sprinter-source.com/forum/showpost.php?p=565120&postcount=41"]
text that will be linked[/URL]
appear.
(5) here's the magic: change the "&postcount=41" to "#post565120" (without the quotes), duplicating the number that the "p=" provides. Also change the "showpost" to "showthread"
(6) so now you'll have
[URL="https://sprinter-source.com/forum/showthread.php?p=565120#post565120"]
text that will be linked[/URL]
(7) and clicking that/this
text that will be linked will take you there, with the entire thread easily accessible.
--dick