Can someone tab it out for me? I'm a bit confused about the ascending/descending thing. Anyone explain? I tried searching but nothing was there of any relevance.
its simple, just raise the 6th and 7th while ascending, and lower them back down when descending.
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melodic minor going up is:
1 2 b3 4 5 6 7 8.

on the way down, you change to natural minor.
8 b7 b6 5 4 b3 2 1

you do that because of the leading tone (7th) when composing, if you were writing in a minor key, classically, you'd want a major seventh so that it will lead toward resolving to the tonic. but going down you want to lead in that direction, therefore you lower the 7th.