To claim your rewards:
Tap the Miners icon in the bottom bar.
Select the miner you want to claim rewards from.
Go to the Rewards tab—you’ll see a claim notification.
Click on it and follow the steps.
The app will ask you to sign the transaction.
Make sure:
You’ve imported the wallet where you minted the device.
That wallet is set as your main wallet.
You can't claim if you are in an account that was not the one used to onboard the device, even if you have imported the wallet that contains the NFNode. Your device is linked to the account where the device was onboarded and to the wallet that contains the NFNode.
You have enough SOL to cover the transaction fee.
Set the wallet used during minting as your Main Wallet:
Tap the icon (▾) next to your wallet name.
Select the wallet that minted the hotspot.
Tap Select as Main Wallet.