In case if you lose access to your Edge Node, having keystore to your Edge Node wallet will help you to access your funds and rewards. Without it you won't be able to access and restore your rewards.
1. Click on WALLET and choose Export Wallet as Keystore
2. Set password to your keystore, you will need this to open your wallet using this keystore. If you forget it or lose it, unfortunately we won't be able to recover it, there is no reset password option as we don't save any data on our end.
3. After saving your password and Keystore, you will find it in your Download folder
Use it here - Official Theta Wallet