Trigger pop up on click

Hello!

I would like to know how to trigger the subscription modal window, by clicking on a tab in the menu of the page.

Is this possible?

I was thinking of adding a class to the menu item and then adding a script:

$(“a.menu-selector”).on(‘click’, function() {
OpenCouponBoxModal();
});

The page I need help with: [log in to see the link]