Programing scales?

So, I've been looking at the program scales features I want a 3rd below a F# harmonic minor and there seems to no help to the wizardy which is the custom user scale creator.
Any help on how the help that thing works?

Anybody, this is genuinely confusing!

I battled through and got it. However, that helps a lot. I think the custom harmoniser is very cool, allows me to add some useful extras and remove harmony from where it isn't needed.
Can't wait to play around with the format shift function.