Hi Shane,
To manually turn on one zone, please find the manual run button in the home page, below the Netro logo, there is task bar "online", "battery percentage", "manual run", "rain delay". Please tap "manual run", tap the square button on the upper right corner to stop watering.
Thanks,
Wency
Netro Support
Thanks for your request and currently our R&D are working on to improve the manual run feature.
Thanks,
Wency