Hi @chuang39,
Welcome to the community 
Please note: We’ve decided it’s best to focus our upgradeability efforts on the Upgrades Plugins exclusively, and have halted development on the OpenZeppelin CLI. See: Building for interoperability: why we’re focusing on Upgrades Plugins
To interact programmatically please see: https://docs.openzeppelin.com/learn/deploying-and-interacting?pref=truffle#interacting-programmatically
To connect to a public network please see: https://docs.openzeppelin.com/learn/connecting-to-public-test-networks