BuddyPress.org

Give this a try

<h3><?php _e( 'Groups Directory', 'buddypress' ) ?><?php if ( current_user_can( 'manage_options' ) ) : ?> &nbsp;<a class="button" href="<?php echo bp_get_root_domain() . '/' . BP_GROUPS_SLUG . '/create/' ?>"><?php _e( 'Create a Group', 'buddypress' ) ?></a><?php endif; ?></h3>