You'll find what you're looking for here:
https://www.gtplanet.net/forum/misc.php?do=bbcode
That's GTPlanet's BB Code List. I'll briefly run down how to do this:
Just before halfway down you see a header called
Post Linking
In there you see this example:
[post=x269302]
Click Me![/post]
That's the generic post link. To link to your specific post, right click on the post number at the top right of the individual post you want to link, that looks like this:
#1
Click on Properties at the bottom of the drop down.
The very last thing you'll see in there is a 7 digit number like this one:
7815134
That's the exact post number of your post you want to link to. Copy it to clipboard by highlighting the number with a left click and drag of the mouse, then right click and select "copy" .
Open your own post where you want the link to go and paste it in there.
Take the generic link above, [post=x269302]
Click Me![/post] and copy and paste it into the post as well, and then delete the generic number of x269302 and move your own post number in there.
Then delete the words "Click Me" and insert your own text and you now have what you're looking for.
In my example it would be like this:
[post=[B]
Seven[/B]815134]DeadNutsEven Racing[/post] << I used seven for illustration only...if you use the number 7 you get this:
[post=7815134]DeadNutsEven Racing[/post]
Sounds complicated but once you get the hang of it, it's 30 seconds of copying and pasting. I have an MSOffice Word file I can open that has bunch of common links saved so if I need them again, I just copy and paste and in seconds it's done.