The latest update of Metamask makes life easier for lovers of the Binance Smart Chain: it is now possible to exchange tokens directly from the desktop or mobile wallet. The Swap feature combines data from decentralized exchange aggregators, market makers and DEXs to ensure you get the best price with the lowest network fees.
The Swap key, located below our wallet balance, ensures that you always have access to the widest selection of tokens and the most competitive prices, providing prices from multiple aggregators and individual market makers in one place. A service fee of 0,875% is automatically built into each quote, which supports continuous development to make MetaMask even better.
Metamask really is the best Wallet for DeFi. If only I had time to finish that article ... ..
You need to switch from Binance Smart Chain to Binance with Metamask. You can use the Binance Bridge. You find it also described here.