We cannot express strongly enough the need for you to back up your public and private keys, seed phrase, and account ID from the Hedera Wallet.
Hedera does not keep this information and cannot restore Hedera accounts — you are the only person that has access to this information. This is true even if you created your account using the Hedera Portal.
After backing up these credentials you’ll be able to access your Hedera account through https://www.myhbarwallet.com using either the public/private key pair OR the mnemonic recovery phrase. To learn how to access your existing Hedera mainnet account using MyHBARWallet.com, please read this FAQ article.
Open the Hedera Wallet (iOS / Android) side-drawer and tap “Recovery Phrase”
Follow the on-screen instructions to copy and securely store all of the recovery words (mnemonic phrase).
Open the Hedera Wallet (iOS / Android) side-drawer and tap “Default Account”
Copy and securely store the “Account ID”, “Public Key”, and “Private Key”.
Note: You’ll need to first reveal your private key within the Wallet application by tapping “DISPLAY” in the top-right corner of the “Private Key” field.