To tune up your ukulele, the correct note needs to be found and then this needs to be 'finely tuned'. ... Ukulele strings should never be too tight or too slack so if you find this happening, you need to turn the peg in the opposite direction.
Should I stretch ukulele strings?
You may just need to stretch your strings
Think of it as your ukulele needing to warm up. Just like singers have to warm up their vocal chords, ukuleles have to "warm up" and stretch their strings. This process is easy and you should definitely try it out before giving up and returning your ukulele!
How should ukulele strings be tuned?
The open strings on a ukulele are most commonly tuned to the notes G, C, E, and A. This is known as standard tuning. To create a more rounded even sound, some people prefer to string their ukulele with a low G string rather than a high G. It is simply a matter of preference.