Hello,
If it was meant the address, where the e-mails should be sent to, then you will need to configure contact form widget on your contacts page (or place it there first, if it is not present there yet). After that you should edit the widget (click "Edit widget" on the right properties tab once the contact form is selected on the editor screen), then go to configuration tab in the widget preferences and specify the e-mail to address in the "Email to" field. Please refer to the image below:
Best regards,
Eric Curtis