What notes of the scale do you raise to get the harmonic and melodic minors?

I am trying to refresh my memory =P
What I remember is for the melodic minor you raise the submediant and ze leading note 1 semitone only when you are ascending, and for the harmonic it is the leading note up 1 semitone…
Please can you correct me on what I’ve got wrong? Thankyou =)

i can’t get a straight answer in simple person language anywhere