The ukulele is actually a member of the family of European lutes. It normally uses four nylon strings tied in a figure 8. In some rare cases, there is a fifth string which is also used in the instrument. The strings of the ukulele have to be nylon treated or otherwise it will not produce the sound that you are looking for.
There are two tuning techniques that can be utilized with ukulele strings. Tuning one way is called an open tuning. In this tuning the open strings are tuned as a tone or note and are not being tuned to the note that is being played by the guitar. The tuning of the other tuning is called closed tuning. In this tuning the ukulele strings are tuned to the note being played by the guitar.
A new string is tuned when you place the tuning pegs on a string and pull it back to release a new string. You can do this in one of two ways. Either by lifting the tuning lever or by placing your finger on a fret and pulling it back. The new string will be tuned as the same note as the one which is being pulled off the tuning pegs.
You may want to use some method of marking the different ukulele strings so that you can easily locate them when you need to change strings. That way you won't have to look at the guitar tuner again to see which string numbers are being changed. Ukulele tuners have three different types of string numbers. You will need to memorize the string numbers to change the strings quickly and easily.
The first type of string numbers is used for lower octaves. These are easy to tune down so you can move quickly through your scale, requiring little effort on your part. This type of number is also called the treble string. You should learn all three strings including the bass string, which is the fourth octave higher than the treble.
The second type of number is the third octave higher than the treble. This tone can be difficult to achieve if you are not an accomplished ukulele player. You can change strings easily with this type of tonewise but there is an increased effort required. You may have to place your fingers in such a way that they remain on the same fret while you are changing strings which requires you to place the index finger and the middle and ring fingers on the different strings simultaneously.
Finally there is the top g-string, which is tuned a half step lower than the second string. Once you have reached the third fret, it is time to do a tuning and a tremolo effect will be achieved if the guitar is tuned using the tritone scale. A half step lower is the standard tuning for guitars, which normally involves only the first, second, and third strings being changed.
At the same time it is important to understand which strings are what according to some music texts. For example some composers prefer the C-major chord to be played with the G, E, D, and A strings as opposed to the C minor chord that can be played with all three of these strings at the same time. Other music texts may indicate the order of alternating the strings which can be written as follows: C G E D A. Whichever system of tuning you prefer it is important to know which notes to play according to some popular music texts as well as their scales.