Next, you’ll need to create a Contact Form. Navigate to Contact > Edit in your Control Panel. You’ll get a default form with your basic fields: Name, Email, Subject, Message.
To provide some context to the form, we’ll add a new field. We’ll call it “Context”, but you could call it something more specific (like “Product” or “URL” or whatever). To do this, we add a Dynamic Text Field that will pull the context from the GET variables in the URL (we’ll set those up in the next step). The GET variable will be called “context”.