To backup the private key in your 12-word home wallet, first tap the rightmost icon in the navigation tab bar to go to Settings. There, tap Restore Wallet. After confirming your PIN, you will be directed to a screen with your 12 words seed and Private Key to back up somewhere safe (usually noted on a piece of paper). You can also use the Copy to Clipboard button.
Be aware of using this safely. We do not save your 12 word private key or seed in our database. Private key data is shown to you only.
Help & Tutorials: https://medium.com/tronwallet-support