When I select a style with 6/8th time:

-all styles are "swing"
-most styles mention the word "jig"
-no styles mention the word "march"
-there are 4 groups of 3 dotted lines so 12 dotted lines altogether.
Does each dotted line represent an 8th note or a 16th note?

I am trying to enter "When Johnny Comes Marching Home" and getting very confused.