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Okay, make sure you have the same exact url (with the www) as you have in the post above in your mainfile.php where it shows your XOOPS directory path.
You then login with the username and password that you gave when you installed xoops. The admin one, not the database one.
Then go to the admin area by clicking on the administration menu link in your user menu.
Click on the icon that says system and you will see the choices you have to install modules, set up blocks, work with the groups, where you make sure that webmasters group has every single box checked so that you are able to work with and access everything on your site.