Here's how you can seed teams into your playoff brackets. There are 2 ways of doing this.
1. Let HC handle the seeding. This automated process is called "Automatic Progression".
Teams are automatically seeded into playoff brackets after your final game of the regular season is played and finalized. Winning teams will also automatically advance to the next round.
(Automatic Progression is turned on by default)
2. Manually set teams into your brackets.
You can then seed teams manually by turning auto progression off. Turn off this feature by going into your playoff bracket page and opening up the preferences tab on the toolbar.
You will now have the ability to manually add or edit teams on the brackets!