rewriting minor key melodies using a key signature

[nvcc]

Im trying to learn how to rewrite minor key melodies using the key signature but I get messed up trying to figure out the raised 7th in a harmonic minor melody. Anyone have some pointers to lead me in the right direction?

[Hmoll]

I'm not sure I understand. The raised 7th is not indicated in the key signature. It is  written as an accidental. For example, in A minor the key signature is no sharps or flats. If you want to use a raised 7th as a leading tone to the tonic, you have to right in G sharp as an accidental.