You can try contacting the admin of the campaign by going to the fundraising site you donated through or signed up for a page under, and scroll to the bottom of the site.
You may find an "About Us", "Contact Us" or "FAQ" page. You can also see if there is any email address or footer links to social media accounts or other contact methods.
Should you have any trouble contacting the admin, please email [email protected] with the fundraising site URL and we can offer further assistance.