Only the Super Admin user can add new content.
if you wish to change that, edit the admin_cms/pages.php page, and change:
Content
<?php if(WA_Auth_RulePasses("Super Administrator")){ // Begin Show Region ?>
<img src="../images/btn-add-small.png" align="right" title="Add Content" class="add-content-page" />
<?php } // End Show Region ?>
to:
Content
<?php if(WA_Auth_RulePasses("Administrator")){ // Begin Show Region ?>
<img src="../images/btn-add-small.png" align="right" title="Add Content" class="add-content-page" />
<?php } // End Show Region ?>