I'm new to Wireshark, and on launch, see a "Welcome to Wireshark" page. There are no instructions, so it's not a great way to start using the product. I'm not sure what to enter at the "Enter a capture filter" prompt, and clicking on various listed networks and other UI elements doesn't seem to populate it. There's a link at the bottom of that page to the User Guide, but it doesn't cover what to do with this Welcome screen