You contact the admin of the campaign by going to the campaign site you donated through or signed up for a page under, and scroll to the bottom of the campaign.
The primary contact email address is listed under "About This Organization" and you can reach out to them with any questions you have about your donation or your personal fundraising page.
Should you have any trouble contacting the admin using the email address provided, please email [email protected] with the URL of your campaign and we can offer further assistance.