How to get rid of the single sign on for facebook app on my iphone?

I used to have to type my password in everytime i logged into fb on my iphone. Now its got the SO thing where i just hit one button. I want to get rid of that and go back to typing in my password. Anyone know how to do that?

Sign Out When your Done Using the app On the Sign in Page and Make Sure the Remember Info Isint Checked off