When you add a recipient other than yourself to your fundraiser, you enter their name and email address. As long as the recipient hasn't accepted their invitation yet, you can update those details at any time.
A new invitation will automatically be sent to the updated email address so the recipient can join the fundraiser and connect their bank account.
After a recipient accepts their invitation, you can no longer edit their details directly. See Changing Your Fundraiser Recipient for guidance on how to handle changes at that point.