If you want to delete the website, and it has alot of content, it is suggest you delete your account and start from scratch.
To remove your account, please paste the following in a reply and make sure it is filled out
Account Deletion Request - Please delete my free hosting account.
cPanel username:
() Inserting an X inside the parentheses signifies that I have made all necessary backups of my free hosting account and will not hold x10Hosting responsible for any data I am unable to recover after my free hosting account is deleted. The X also serves as my digital signature verifying that I have proper authorization to request account deletion of the account specified.
To just reset, FTP in and delete all your files, go to cPanel and delete your databases, and delete all your subdomains made.