Importing/Exporting Wallet Private Keys and Mnemonic Phrases

Importing private key and mnemonic phrase
Wallets can be imported to ONTO using private keys and mnemonic phrases as shown below.
Step 1: Launch ONTO wallet and tap on the avatar icon in the top left corner. Select "Manage Wallets" from the navigation menu that appears in the left.
Step 2: Select the "Add new wallet" option, and then select "Import wallet" from the pop-up.
Step 3: Select "Import other wallet", and then look for the wallet that you want to import. For e.g., TRON wallet.
Step 4: Tap on the Private key, Mnemonic, WIF, or Keystore tab based on the import method you want to use. Next, enter the required details as per your selection, the wallet name, and the wallet password. Then confirm the action. Finally, tap on done to complete the process.
Different wallets may have one or more associated import methods that are supported in a given version of ONTO wallet.
Exporting/Backing up the mnemonic phrase
Step 1: Launch ONTO wallet and tap on the avatar icon in the top left corner. Select "Manage Wallets" from the navigation menu that appears in the left.
Step 2: Tap on the ellipsis icon on the upper right side of a wallet option to bring up details and options for the particular wallet.
Step 3: Select the "Export mnemonic phrase" option from the list. Then enter the current wallet password in the pop-up to proceed.
Step 4: Tap on the "Copy" button to copy the mnemonic phrase, and store it in a secure location. Next,  select the words in the correct sequence to verify the backup copy and complete the process.
Note: The mnemonic phrase, just like the private key, grants full access to the wallet. Please store the mnemonic phrase safely and do not share it with anyone.
Exporting the private key of a wallet
Step 1: Launch ONTO wallet and tap on the avatar icon in the top left corner. Select "Manage Wallets" from the navigation menu that appears in the left.
Step 2: Tap on the ellipsis icon on the upper right side of a wallet option to bring up details and options for the particular wallet.
Step 3: Select the "Export single-chain" wallet option from the list. 
Step 4: Now from the list of wallets, select the wallet for which the private key is to be exported. Then select the "Export private key" and enter the password to proceed.
Step 5: Tap on the "Copy" button to copy the private key, and store it in a secure location. Tap on "Done" to complete the process.
Note: The private key grants full access to the wallet. Please store it safely and do not share it with anyone.