apache2 ssl

[slam]

how do I setup apache2 ssl.
I have php setup and in the info that php give it says that ssl is enabled. However if I start apachectl startssl I cannot access my site with https://localhost but I can with http://localhost

what do I need to change
is it my listen?

thanks
Eric

edit: I ran apachectl -L and it doesn't show mod_ssl do I need to recompile? if so does that mess up php or mysql settings.