How to turn off autofill on the Iphone 4?

My friend wanted to check the internet on my phone and i had to delete my autofill because I ask personal questions online sometimes and it shows up on the autofill. However is there any way i can turn off the autofill so i won't have to deal with this again. I tried going to setting and to Safari but I could not find how to turn it off.

Go to password and autofill in SAFARI. Turn it off or Reset safari. If autofill occurs while you type then go to keyboard settings and turn shortcuts off. You can use chrome, mercury or any other browser you like.