Metamask is an Ethereum wallet that can be installed as either a browser extension on a desktop or a standalone app on your mobile device. You can also link your BSC wallet to MetaMask.
Step 1: Go to the MetaMask download website (this link).
Step 2: Click on the appropriate button within the website's page for installing the wallet as a browser extension on any of the supported browsers listed
Step 3: Click on "Add to browser name".
Note: If you do not see the window, you may have to disable a popup blocker or other security measurements for this page
Step 4: On the next screen click on "Add extension".
Step 5 (optional): If you don't see the Welcome to MetaMask screen you may also have to give access permissions to this extension at the circled icon
Step 6: Click the "Get Started" button:
Step 7a (Existing wallet): If you have an existing wallet that you would like to import and have your secret phrase stored somewhere, you can click on the option to the left "Import Wallet".
Note: also see: How to Setup BSC on MetaMask
Step 7a (New wallet): If you are starting a new wallet, you may select the option on the right "Create a wallet". This will guide you through creating your new wallet, and have you set up a password for the extension in order to gain easy access to your wallet from your browser each time you open your browser):
After that, you will get an explanation of what your recovery phrase is, and we recommend you to backup and store this phrase someplace secure and follow security guidelines. Always keep this information private, else if compromised, you could lose anything held within your newly created wallet.
You are now logged into a brand-new wallet.