How do I check sent applications if someone send it?

You should receive an email for the application. Your primary email address will be the default recipient of the form. Please check that.

https://www.jotform.com/help/41-How-to-Change-the-Email-Address-Used-for-Notification-Email

You can also access the submissions in the submissions page of the form. The below guide should help you get into your form submissions:

https://www.jotform.com/help/269-How-to-view-Submissions