Tell us what you want changed and this page writes the message for you. The more of it you fill in, the less we have to guess — and the more likely you get back exactly what you pictured.
Once you have approved something, we mark that request finished. If you want more changes to the same screen later, that is completely fine — we log it as a new request so it gets the same screenshots and the same approval, and nothing quietly gets lost in a chat thread.