Thank you for contacting us regarding your question.
In order to show popup by click on the button of Pricing Table, follow the next instruction:
1. Open needed pricing table
2. Click on the button element to call it’s editor
3. Click Link
4. Insert your popup shortcode – [ contact-form-7 id=”420? title=”BY” ] – in the Link field
5. Save changes http://prntscr.com/fk6l70