force login at boot up?

How can I force a login at boot up? I must login if it goes to sleep but not at boot up.

 

I have done it...used the instructions at 'The Road to Elysium'

Disabling autologin


Warning: Take caution when commenting out lines, and inserting new ones. The lack of a single character may render your system useless.
Open the file named /etc/rc.d/rc.S and comment out the following line:
/usr/bin/xinit -- -br>/dev/null 2>&1 &

Like this:
#/usr/bin/xinit -- -br>/dev/null 2>&1 &

Below this line, insert the following:
/usr/sbin/gdm

And that’s that. The username is user and the password is whatever you set it to be during the installation.

Should you for some reason be unlucky enough to forget to add /usr/sbin/gdm to the file, but still commented out /usr/bin/xinit — -br>/dev/null 2>&1 &, and rebooted, do what David here did.

 

Ok I'll give it a try. How about adding multiple users???
thanks!