Yes they can! First they will need to select "View Notifications” and either see emails they have on file or add new emails in:
If they do not have any emails associated with their account it will look like this:
At this point they can add their email address by entering it into the text box and selecting "Add". The patient also has ability to delete email entered by them thru patient portal, but they will not have an ability to delete email received in the file from the hospital. As you can also see from the screenshot below, they have the choice to choose which emails are used.
During the payment flow, patient will also be able to enter new email address and agree to receive email notifications. This will be available to them on the last screen before submitting the payment:
This email will be stored on the account and the patient will be able to turn it on or off and delete it though the Notification tab above. It will also be shown in the back office with a column that shows it was entered "Online".