How To Tune?
It's simple: the tuner will show you if the note is below or above the tuning, until the center point lights up and shows you that it is in tune. If the tuning is low, just tighten the tuning peg a bit. If it's high, do the opposite, loosening the string.
How often should I tune?
Regular use, room temperature, and humidity can affect your instrument's tuning. Therefore, you should tune your instrument periodically or every 1 hour of use.