Find URL: Post
Visit the forum which has the post you are trying to find.
Click on the board where the message is located.
You are now viewing the list of topics on this board.
Click on the topic which the post is in.
Scroll down to the post that you want the URL for.
Click on "Link to Post" at the bottom right corner of the post.
A new page will load.
Copy the URL from your address bar. This is the Post URL.