How to make fields required

On any field, if I hit return, it automatically submits before the form is completed.  Can you tell me where the setting is to fix this so that it only submits when the person is done completing the form?

You can prevent that your users submit your form before they fill it by making fields inside of your form required. 

I have tested your form and I noticed that some of the fields inside of your form are required. 

I was not able to submit your form without filling all required fields.

Hope this will help. Let us know if you need further assistance.