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Open Wireshark. On the left side there is an option to start capture. Left click with your mouse to select the appropriate network adapter listed below the start command. If you are not sure about which adapter to use, select them all using ctrl + left mouse click. Hit the start button once you’ve highlighted the appropriate adapters. Leave this program running.

I can't figure out how to do/where to do the part in red. Some please help me out.