All taken care of
The drain is at the bottom of the big section of the primary cover. This will show you where.
Primary Chain Case Servicing - Harley Davidson Community
You refill it either through the small cover in the middle of the primary cover or even better do it through the big cover with the 5 torx bolts in it. They should be a #27 torx, make sure not to use a #25 which will fit but be a bit sloppy so you don't strip the bolt heads out.
When you refill it, have the bike straight up and level and fill it to the bottom of the clutch hub as shown in this picture with the arrow. The cover here is removed for a better view.
