Tuning Instructions
Here's my attempt at the tuning instructions. It may be a little longer than you were looking for; however, I think it hits points that would help the newest player understand.
TUNING INSTRUCTIONS
There are three basic tunings for ukuleles depending on which size you use.
All tunings start from the top string and go down:
Soprano, Concert, Tenor Sizes: "C" Tuning = G,C,E,A (Standard tuning)
Soprano Size (Optional): "D" Tuning = A,D,F#,B (Less common tuning)
Baritone Size: "G" Tuning = D,G,B,E
The tuner follows the musical scale, which consists of the first 7 letters of the alphabet, A through G. If you need to tune the ukulele string to a "C" and the tuner indicates the string is currrently playing an "A", you will need to tighten the string until it reaches the "C" because a "C" is a higher letter in the alphabet than an "A". Keep in mind that after the "G" note, the scale starts over again with the "A" note.
Stand alone letters are considered "natural" notes. In other words, when you are tuning your top string to a "G", you need to achieve a G "natural". If indicator says G#, meaning G "sharp", your string is slightly tighter than a G "natural" and you will need to slightly loosen the string to achieve the G "natural". Likewise, when the indicator says Gb, meaning G "flat", your string is slightly looser than a G "natural" and you will need to slightly tighten the string to achieve the G "natural". Simply put, if you are "sharp" you are tuned higher than a "natural" and if you are "flat" you are tuned lower than a "natural" note.
Happy Tuning!