You must have the Binance Chain wallet extension installed in your browser. You can download it in the chrome web store.
click on ‘Connect Wallet’, accept Terms of Service, choose network and wallet - ‘Binance Chain Wallet’
Confirm connection to 1inch.io in the Binance Chain Wallet.
Please, note that Binance Chain Wallet supports Binance Smart Chain and Ethereum Mainnet networks. To swap, you will need to select the same network on both the wallet and 1inch interfaces. To select network in the Binance Chain Wallet, click on the drop-down menu in the upper part of the screen.
You will then be able to interact with 1inch.io in your desktop browser and confirm any transactions in the Binance Chain wallet.
Known Binance Chain Wallet issue:
If a user doesn't have BNB on his/her balance, nothing will happen upon pressing the 'unlock' button.