On other boards besides the rating system they havea system of post counts after so many posts you get like 1 gold star 2 gold etc.. i was wondering how that works?

It basically functions how the member status works; when a member hits a certain post count their status is "upgraded" to a new title; in the "post count star" system, instead of "upgrading" the user status name it upgrades the image

I checked it and i think i might not be too stupid... is this right to activate it.

In each one on the posts instead of giving the title use HTML and just load the image for the star etc..?

i think you can drop in in the title box; else you'll have to use html heh (if enabled)