When I first purchased my ipad and connected to itunes, I needed to enter my itunes password every time I installed an app. Now though, for whatever reason, if I want an app and click on it, it installs without asking for the password. Given that on only two occasions I've paid for something which was cheap, my usual route is to try out those I fancy that are free via AppZappPro. This morning I all most made a huge error and almost clicked on something expensive. Can someone advise me (and explain easily please) how I can revert itunes to asking me for password.