To sign in to your page, you will need the email address you used to register for the event and your password. If you don’t have a password, you can request a password to be emailed to you:
Go to “Log In” and click on “Participant”
Enter your name, then click on the “Forgot or don't have your password?” link.
Once you have signed in, you should be able to edit your PledgeReg donation page.