Need help connecting BCS trust wallet

I’m registered to be involved with a presale of a token, and connected my trust wallet to bounce, but it will only show the ETH connection and no matter what I try I can’t get it to switch to allow BSC transactions or even the wallet to show up. The auction is tomorrow so I’m hoping to resolve this as others I’ve talked with said they just click the ETh on the wallet snd it gives them the option to switch to BSC, mine doesn’t allow me to do that, and I have no idea what I need to do. The wallet address is my trust wallet, I don’t keep any ETH on trust wallet, only BSC and other BCS tokens. If someone knows how to help I would appreciate it.