First navigate to billing.crossclave.com. After you have done so, select the 'Log in' button. You will then be prompted to enter your e-mail address you used to signed up from the CrossClave app. Enter that e-mail address and SpiderOak will send you an e-mail with an authentication code. Take that code from the e-mail and enter it back into the CrossClave site where prompted and you will then be logged in to the account.