Metamask is a wonderful application. To understand what it is and how to download it please visit the Metamask blog. When using Metamask it will be important to add certain blockchains to your account.
The settings for adding Binance are as follows:
RPC:https://bsc-dataseed.binance.org/
ChainID: 56
Symbol: BNB
Block Explorer: https://bscscan.com