From their FAQ:
Sign-in to the account you want to delete and go to http://tinychat.com/profile/account/ . Once there, click ‘I want to disable my account’ and follow the instructions. Please note that once it is disabled there is no way to get it back.
URLS:
http://tinychat.com/
http://tinychat.com/profile/account/
Please note that AccountKiller.com is not associated with the business listed on this page. AccountKiller provides easy-to-understand instructions and guides on how to cancel charges and relationships from the list of businesses on our site, we have no affiliation with these businesses.