Securing access to content in a widget tab

I am trying to secure content in a tab generated by a plugin, the URL structure is
I would like to protect all #special_offers.
I have attempted to do this by putting special_offers and #special_offers in to the “URI That Requires Level 0 or Higher” box. All members will be at level 0.

So far I have not been able to make this work.

Is there a way to secure just this part?

I am using the free version for this site. I have the pro version but wanted to use the WordPress default registration.