Help with these Quest PLEASE!

I dont know what to do in these quest to complete them .. HELP ME PLEASE!  :wtfvegeta: 

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And also i wanted to know what is the purpose in this middle section of the store .. i cant buy from it or is it something the owner of the store wants or wants to trade? ..could anyone help me please?   

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The quests you've selected are the PvP quests ! ^^

The square on the right in the last pic' is what the owner of the Booth wants. So it means that he wants "Silver Powder" ^^

Thanks a lot for your answers  :cheers:  .. but if I have Silver Powder for example then is there a way to trade it in that window or is that window just to see what he wants?