Question How to use a new cable tester?

[axlrose]

This feels like where I need to cable test. Can anyone help me with now to use this cable tester to find if there is anything wrong with any of my runs now that I have replaced the small flat patch cables with solid ones from Monoprice and found the problem persists?

Anyone with steps on how to use the cable tester to check the lines I've run? I haven't used one before, but bought one.