how do u take screenshots and when u do what folder does it save to and finally how do u post it on the forum
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Use F11 key, to post them on the forum you must have a server of your own or space on some other server, just link from there.. 
That works too, and you can choose which image format you want to save it in. However, you can only 'store' one screenie and you have to minimize the game and go through the whole save as process every time. F11 has its disadvantage in that it is always saved in bulky bmp files, but you can take as many as you like and just convert them to png later when youre short on space or want to post them or something.