Motorola Defy :: Forgotten Or Lost The Screen Lock Option

I often switch the feature to have to slide the screen lock to use the phone on or off. It's currently off and I can't find the menu item to turn it on again! Where was it again? I've got a standard Motorola Defy 2.2.By the way - the only reason I'm always switching it around is because when I'm expecting a lot of calls/texts, I turn it on. Because when I get a text and the phone's in my pocket, I often press something when taking it out as getting a text/call unlocks the screen.For the rest of the time - I find it irritating to have to press the power button and then slide the screen - why both? It's not like it's hard to accidentally press the power button on the Defy!In a way - that "in pocket detection" option sounds ideal but I found it kept cutting in when I didn't want it to.Maybe I can do something with that "tasker" app so that when I press the power button, it unlocks the screen.where is that screen lock option again?