If someone sees this post and doesn't know how to get bsc testnet on metamask and how to get BNB on testnet here's few links.
To set up BSC testnet on metamask : https://academy.binance.com/en/articles/connecting-metamask-to-binance-smart-cha...
get testnet BNB. here's the faucet : https://testnet.binance.org/faucet-smart