The following steps were done on the Goerli testnet so expect some images to be different but the steps are the same.

There is an account activation fee applied on the first transaction after depositing. Deposit an additional ~$20 to cover it during high gas fees. Learn more about the account activation fee in https://matterlabs.gitbook.io/zksync-community-hub/support/faq#what-is-the-account-activation-fee-on-zksync-lite.

Click on the Ethereum symbol in the bottom right to switch between mainnet and testnet.

To connect your wallet to the zkSync Lite Mainnet select the "Ethereum Mainnet" for your network.