Password protected website using cPanel

I protected my web site using C panel (Password Protect Directories under security section). After when I set password, then log in to website its ask password & work properly..

But.... when i exit browser and re-log in with few time after to same web site it did not ask password & directly log in to web site........

How to fix this.........

My requirement is:

when I log in every time to web site..... password must be ask.

Thanks.................