Trekpay..I can't understand it.

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I recently joined Trekpay..I read their FAQ and found out that i need to click their ads through browse/search link..I clicked 3-4 ads for 3 credits each and did whatever was required(open the link and open another ad in it) and then i did 1 ad for 1 credit where i had to just open the blog..I did and read it and closed it..But my credits are still zero.. I was shocked..! I don't know what happened..Any ideas? will my credits be updated later? Also,What is the minimum payout? and how much credits do i need to reach it every week? Thanks