The method I have for doing that is a bit convoluted.
I go to the person's name and click on "Find more post by XXX" I look up the post I want to link, then click on the 'mini-link' beneath the thread title. This opens up another window and I go to that window and copy the address there. That address should take you straight to the post in the thread.
Pretty sure there's a better way of doing it though =/
example:-
http://www.fiestafan.com/forums/show...2821#post92821
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