How do I add Wmatic to MetaMask?

Could you please explain the steps involved in adding Wmatic to MetaMask? I'm new to this process and would appreciate a clear and concise guide. Specifically, I'm wondering if there are any prerequisites or settings I need to adjust in MetaMask before attempting to add Wmatic. Additionally, I'd like to know if there are any potential issues or challenges I might encounter during the process, and how to troubleshoot them if they arise. Thank you for your help.