Problem with adding content
You need to go into People -> Permissions -> Roles.  Find the administrator role and click on 'Edit Permissions'.

Then, go down to the Node section, and check off the appropriate permissions for viewing, creating, editing, deleting, etc.. that particular content type.  The permissions actually look like this:

Article: Create new content [ ]
Article: Edit own content   [ ]
Article: Edit any content   [ ]
Article: Delete own content [ ]
Article: Delete any content [ ]


You'll of course want to check off probably all of those if the role is an administrator, as typically they'll have absolutely power over your application.  That is, if it's what you intend.  The power of Drupal is yours :)