How do I add Gala to MetaMask?

Could you kindly elaborate on the steps involved in adding Gala to MetaMask? I'm a bit new to this and would appreciate a detailed guide. Would I need to search for Gala's contract address or is there a simpler way? Also, is there any specific setting I need to configure within MetaMask to ensure a smooth process? Could you provide any advice on how to ensure the security of this transaction? Thank you for your assistance.