To see what post gave you rep, is pretty simple.

Simple click on UserCP at the top of the forum, immediatly on that page will be your recent rep, green for positive, red for negative.

Itll look like this....

[] "Title Of Thread" -- "Date" --"Name of rep giver" -- "Comment"


To see what post got you your rep, click on the title of the tread and itll take you to that exact post.



Hope this helps