Hi,
When you edit the contact page, you will find the contact form shortcode. Please specify the email address in the shortcode as shown below
[contact_form mail_to="admin@example.com"]
If you want the same message to be sent to multiple addresses, then specifying multiple addresses with comma separation might do the trick. Please see the snippet below.
[contact_form mail_to="admin@example.com,info@example.com"]
Hope that helps. Thanks.