Click on your Solana balance in the token list in the Phantom browser extension.
Select Start earning SOL.
Search for Coinbase in the search bar of the validator selection screen and select the Coinbase validator.
Enter the amount of SOL you would like to stake and select Stake.
COINBASE VALIDATOR INFORMATION
Validator name: Coinbase
Validator ID: XkCriyrNwS3G4rzAXtG5B1nnvb5Ka1JtCku93VqeKAr
Validator vote account address: beefKGBWeSpHzYBHZXwp5So7wdQGXGmu4ZHcsH3uTar
Validator name: Coinbase 02
Validator ID: CW9C7HBwAMgqNdXkNgFg9Ujr3edR2Ab9ymEuQnVacd1A
Validator vote account address: 6D2jqw9hyVCppZExquxa74Fn33rJzBx38T58VUcHx9
Congratulations! You are now staked to a Coinbase validator.