Once a guest/participant enters their name/email and completes their squares/bracket, they are added to the official fundraiser roster. In order to delete them for whatever reason, simply login and go to the "Fundraiser Backend" tab, then proceed to the "Remove Contestants" tab below the fundraiser information. You will be able to manually remove anyone and their submissions, from your fundraiser. In the event of abuse, support can block the IP address of the user - please email support@squarefundraising.com for more help.