The easiest way is to go into Web Host Manager -> Service Configuration -> PHP Configuration Editor and then switch into Advanced Mode (link at the top). Then you can edit those from there.
Alternatively you can edit them under php.ini directly, which can be found at:
/usr/local/lib/php.ini but it's more of a pain doing it that way and don't forget to restart Apache afterwards for the changes to take effect.
This assumes you've got root server access. If not then you'll need to talk to your web host.
Edit: I think you can turn off Register Globals by using .htaccess commands, but the others will be system settings so really you're going to need the root access.
Trev
