First you'll have to create your BFK account:
1- Go to: https://marketplace.bfkwarzone.com/
2- Select and link your wallet
3- Select Sign-up and create your account using your email address
4- complete the registration
After creating your account:
1- Click on your wallet (on the extensions part top-right your browser)
2- Click on "Import tokens"
3- Paste our official Contract address on "Token contract address" : 0xA5438dF34698df262D5ed463F10387c998EdC24A
4- Click on "Add custom token"
5- Your BFK tokens will appear on your wallet