Step 2: Set up your mail settings on Mail tab of Contact Form
On Mail tab first of all you need to add your email address(es) where you'd like to receive form submissions.
Please pay attention on field values in Subject and Mail Template sections. In Subject field you can change not only text but also field id if you'd like to see in the subject another field instead of user's website.
For example, if you'd like the name of user to be displayed in the subject, you need to go to Name element on Form tab and copy its field id.
Then you need to insert this field id to your Subject field. The same way you can edit Mail Template - change its text and replace field id with another one if needed. Also [form data] in Mail Template stands for receiving all the data filled by user. However, if you don't want to receive some information from your form, you can replace [form data] with field id of elements you'd like to receive.
The last section on Mail tab is Additional Mail Settings. Here you can add email address(es) to Copy and Hidden Copy. Also, in Reply To field you can add email field id. In this case when you reply on the email with form submission, your reply will automatically go to the email address of the person who filled this form so you don't need to insert it manually.