Plisio wallet does not support the buying of Binance Coin (BNB) directly from within the wallet. Plisio only support the storage and transfer of cryptocurrencies, and do not provide a platform for buying and selling. If you want to purchase Binance Coin, you'll need to use a separate platform such as a cryptocurrency exchange. You can then transfer the Binance Coin to your Plisio wallet after the purchase. Before buying Binance Coin, make sure to do your research and compare the fees, security measures, and overall reputation of different exchanges to ensure you choose a reputable platform.