There are three areas in which you need to focus:
control7561033-1=Johnmeans that the field with the name
Johnas the prefilled value. The field with the name
control7561033-2is prefilled with the value
Doe, and so on. Field – value pairs are linked through the operator
&. To identify form field names, inspect the form code using a browser inspection tool.
Now save the code and preview the result. The code above looks like this:
[123-contact-form i507842 control3592242-1=John&control3592242-2=Doefirstname.lastname@example.org&control3591577=This is a test message.]