How do I define a sub-user?

I want to allow the Executive Director to access the completed forms.  Also can I have the response messages sent to her directly?

I want to allow the Executive Director to access the completed forms. 

You can add him/her as a Sub-user to your account. A Sub-user can edit forms and view submissions. Here's a guide: https://www.jotform.com/help/232-How-to-share-forms-with-a-sub-account-user.

You may also share the form submissions page to another user. Here's a guide: https://www.jotform.com/help/199-How-to-Share-Form-s-Submissions-Page.

Also, can I have the response messages sent to her directly?

You can change or add an email recipient in the email notification wizard. Here's a guide: https://www.jotform.com/help/25-Setting-Up-Email-Notifications.

Hope that helps. If you have any questions, let us know. Thank you.