itouch dumb simple question

i feel pritty dumb asking this because i think theres a simple answer and im just missing something but how do i make it ask for my itunes account password everytime i buy/download something from appstore or itunes on my itouch because i dont want other people to accidentally or intentionally buy stuff
Answer #1
I think there is a little box that says “keep me logged in” or somthing… untick that that might be your answer
Answer #2
any idea where that option would be located? =/
Answer #3
on the top under the searsh bare ,, there is an icon its said -open season- click on it , and type ur id and password