Step by step how to fix “Please Update Your Secure Tab URL” error on Facebook Pages/Apps.
The error looks like this:
Please Update Your Secure Tab URL
To make sure users can view your app over a secure browser connection (https), please visit the developer console to update your Secure Tab URL.
Update secure URL | Temporarily turn off HTTPS
The problem here is that the application/page that is supposed to be displayed in this place is hosted on unsecured server. To fix it, you must buy SSL Certificate for the hosting that you use for your Facebook App.
The cheapest SSL Certificated cost around $50/year. We suggest purchasing your SSL from rapidssl.com or instantssl.com.