On my main menu I have an option that when I'm logged out I can see but once I log in its gone. How do I fix that so I see it?

Do you mean the whole main menu, user menu or other menu (multimenu) is not displaying when you log in?

Goto the admin menu if you are unable to see your user menu when you log in just follow this link:

http://www.yoursite/admin.php

Then go to groups admin:

In XOOPS 2.0.x you hold the mouse over the system icon and choose groups from the popup menu.

In XOOPS 2.2.x groups is found under the link for users, however I don't know if this is theme specific.

Eitherway, once you get here:

http://www.yoursite/modules/system/admin.php?fct=groups

you should be able to edit your groups permissions make sure that registered users and webmaster has access to specific menus.

Dave