You must submit a withdraw request via a form and write directly to Netcoins’ backend. Canceling an account is not explicitly easy, as the help center on the Netcoins website doesn’t make it clear how to do it. If you go to the “Submit a Request” section, you can select “Withdraw” as one of the subjects that the email form gives you. However, there’s no help topic called, “Canceling Your Account,” so doing so easily doesn’t seem to be an option.