I found this you tube vid, and think this will help others too.

To understand the vid you need to understand what chords are, and some music theory, but I think he explains it well.

He is not using lmms, but that does not matter, all he does, we can do in lmms.

(How to tranpose in lmms:

select a note, press ctrl and then the up or down key)

A lot of this is also shown in one of musicbear tut vids about chords.

https://www.youtube.com/watch?v=tHAl4jYCEGU