The best way to access the settings for muting and archiving messages from strangers is to go to the Privacy & Security tab in your settings. This tab will allow you to customize your account's security settings, including muting and archiving messages from strangers. You can choose to mute or archive messages from people you don't know, or from people who are not in your contacts list. This is a great way to keep your conversations private and secure, while still allowing you to communicate with people you don't know. Additionally, this setting can help protect you from any unwanted messages or contact requests.