how to fit and install a wifi card....can anyone tell me?

hi i dont know much about computers so i need to know detail for detail how and which way to fit my wireless card into my pc...i have installed it but it does not appear under my internet connections? how do i chechk if i have done it right? im not to sure how to get it going either..i heard something about activating it in bios but i do not know how to get into that?

 

i sound silly dont i ? but pls help anyway

 

thanks alot