How do I add and remove email addresses that submissions are forwarded to?

In editing page of your form, you see the email button. When you click to that button, you can see current notifiers. Move your mouse over to the notifier that you want to delete, there will be a red cross appears on that line, by clicking that sign, you can delete that notifier. If you want to add new ones, just click to the add new email and choose the features with following screen as it is shown above in the pic. 

Yes, as our friendly user 1ow4 has said, you can add or delete your Email Notifications.

However, if you only want to edit / change the email address of the recipients, you do not need to delete or create new notifications. You can simply edit your existing notification by going to Setup & Embed > Emails, and clicking on the Notification.

In the screen that opens, you can click on the Replies-To and Recipient Settings button to open the page where you can edit your recipients.

You can refer to the following guides for more details about setting up Email Notifications:

http://www.jotform.com/help/25-Setting-Up-Email-Notifications

http://www.jotform.com/help/30-Notification-Autoresponder-Email-Details

http://www.jotform.com/help/39-Send-Notifications-to-Multiple-Recipients

http://www.jotform.com/help/208-How-to-setup-email-alerts-to-prevent-email-bouncing-related-issues

Please let us know if you need further assistance.

Thanks, your help was perfect.

On behalf of my colleague you are most welcome!  If there is anything else we assist you with, let us know and we will be happy to help.