You can visit MeSince website to use MeSince APP scan QR code to log in your account and apply for revocation of the account certificate. If you have already set the certificate protection password, you also need to enter the certificate protection password. Please note: Once the certificate is revoked successfully, messages encrypted with this certificate will not be decrypted except you get new certificate.
Also, please note that if you use MeSince for illegal purposes, MeSince reserves the right to revoke your encrypting certificate and signing certificate. Once your certificate is revoked due to the illegal use, this email address will no longer be allowed to apply for a new certificate, nor can the revoked certificate be used to decrypt previously encrypted email. Please refer to the relevant legal terms.