You may need to add custom token details to your MetaMask for Carbon tokens to show. You will also need to be connected to the BSC network.

The custom token details are:
SYMBOL: CARBON
DECIMALS: 18
CONTRACT: 0xeFb5dF8eB84055026018030E71bC2cdFA2F138B9

If you are having trouble seeing your token balance, please search your address on BSCScan and see the tokens section to make sure they are in your wallet.