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I'm sorry but I'm not sure if I understood correctly your inquiry, so please provide more details if I missed to understand you correctly.
If you wish to change the email address that receives the notifications you can change the recipient address:
You can see here more details:
If you wish to collect the email of the users, you need to add an email field to the form and make it required.
This way only if users add an email address they will be able to submit the form:
Let us know if we can assist you further.