I'm telling you, all that information you can get
only from your hosting support center.
In fact, all hostings I've tryed included such basic information, including a link to FAQ or help desk, into the email after my registration. So, I bet you got something as well.
The only thing they cant tell you is the admin account and password for 4images itself (last 3 fields in "Admin configuration" part) These you enter yourself, its an account you create which will be an administrator on your gallery.
[EDIT]
Looking at your screenshot:
See the button "Add DB" ? ever tryed type something in the field next to it and hit that button? Why not?