SSL Stripe Question

From the S2 section about Stripe.

“Once you’re live, you can add the Custom Field s2member_force_ssl = yes to any Post/Page.”

Please, is that to go in a shortcode or literally just anywhere? If in flat HTML or in a WP page builder?

Sorry, if I have missed that mentioned somewhere in the instructions.

It goes in the Custom Field box on the edit screen for the page or post in question. If you don’t see it, scroll down to below where you input the content, and make sure it’s set to show according to the Screen Options tab in the top right.