How to add smart chain network to MetaMask?

Hello there, I'm curious about adding a smart chain network to MetaMask. Could you please explain the process step-by-step? I'm not very familiar with technical jargon, so a simplified explanation would be greatly appreciated. Specifically, I'd like to know how to locate the custom RPC, what details I need to enter, and any potential security considerations I should be aware of. Additionally, could you also mention any potential issues I might encounter and how to troubleshoot them? Thank you in advance for your help!