Thanks for your reply. I want to update the topic; I couldn't follow the link because I couldn't get F4 work as told in the guide (I think because of my keyboard). But I tried another joypad which is identical and that worked just well, really weird.
And I wanna ask another question;
Since raspberry is getting warm I have ordered heat sink with a fan (link is below) but it says running current is 0.2a and I guess that I cannot feed it from directly raspberry pi 3 (for which I have 2.5a adapter), or can I?
http://www.dx.com/nl/p/copper-aluminium-heatsink-fan-cooling-kit-for-raspberry-pi-black-443690#.WBspOPrhBIA