The minor scale is a very important scale, as it gives you that dark sound that the major scale won't provide. This scale is considered as: 1, 2, 3b, 4, 5, 6b, 7b. The "b" next to the notes mean flat, which is related to the major scale. So, compared to a regular major scale like C Major scale: C, D, E, F, G, A, B; the minor scale would be: C, D, Eb, F, G, Ab, Bb. If you were in the key of E Major you would have: E, F#, G#, A, B, C#, D#; but if you were in the key of E minor, you would have the notes: E, F#, G, A, B, C, D. Notice, that having flats next to the numbers in the minor scale doesn't necessarily mean that your notes will be flat, but rather that they will be one half tone lower than its major counter part.
Below is a graphic showing what the minor scale looks like on the ukulele. The green colour is the root note. So, you simply need to find the root note for the key signature you are playing in and start the scale from there.
Minor Scale (Ukulele)
Practice going up and down this scale to remember it well.
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