In the search box insert binance smart chain testnet
Click the connect your wallet button on the top right (if Metamask is well connected the fox icon appears)
And click add to Metamask button
Add the BSC testnet to Metamask using chainlist.org
Deposit test-BNB token to your BSC Testnet wallet
You will then need to load your wallet with enough test-BNB (abbreviated as "BNB") to pay for gas fees when you deploy your organization and make transactions within the organization.
Please note that the symbol of the test-BNB is BNB - **** the same as for mainnet-BNB.