How to make a private option to disable elements?

I am developing an artwork website. On this website there is a page that allows people to check off that they’ve accepted my terms of service and fill out some information before sending a commission order form. Thing is, I don’t want this order form page to constantly be active. I need a private ‘accepting commissions’ option somewhere that disables some elements in the orders page. How could I achieve something like this?

Hi Graeme,

Does the form need to fill in every time, when a web user was doing order ?

Hi Heson,

Yes, the form does need to be filled out every time the user wants to make an order.