You may want to inform your participant of his permanent email address.
How to get there:
You'll be on the Campaigns window of the Control Panel.
Choose the campaign's name or the edit link to the right of it.
What to do:
Click on the Participant tab.
Scroll down to the name of the participant you’d like to get information for, or enter their last name in the search box.
Click on the first action item, the Edit button (pencil icon) adjacent to the name.
The permanent password will be listed towards the bottom under Permanent Password.