Call a shopify form by id on a button click

[Omniscientbsg13]

 I am actually looking for a help regarding shopify forms, I have a form called Measurement form which is meant to take measurements from the users, I want to add a button called "Customize" above the buy now button on the product page, and I want the measurement form to open only when the button is clicked

[jamalsoueidan]

Is this in liquid page or where exactly? Add screenshot or code please :=)