Automatically switches to your pre-selected resolution. Enables premium when possible.
< Σχολιασμός για τον κώδικα Youtube HD Premium
You access it from whatever script manager extension you use (TamperMonkey, ViolentMonkey, etc). If you really don't see that option there then it is possible that whichever extension you are using is not compatible.
Sorry for not replying earlier, feel free to ask more questions if you still need help.
How do you access the "UI menu for easy quality selection"??