Articles restriction URL Redirect

I'm experiencing an issue with the URL Redirection in the Articles restriction Plugin. The default redirection when sending the viewer to my membership registration page sends the user to a "component/osmembership/nonprofit/nonprofit-membership?Itemid=768&filter_plan_ids=1" default url, which is not in my menu and thus the page loads with no header and obscures the menu. The CORRECT redirected URL should simply be mywebsite.org/sign-up-for-nonprofits

I entered the URL redirect in the plugin but it still continues to send me to the default page, not the one I entered. You can see in the accompanying attachments the problem I'm having.

I appreciate your hard work and thank you for your assistance!