Collectible Card Game Headquarters

I have scoured all the Forge menus, and I cannot find the button to start a Planar Conquest game. I know I'm using the right version (latest); I see the Planar Conquest tab in the Achievements screen. I read the readme, but it didn't give any help.

How do I actually select the Planar Conquest mode? I want to get out there and kick some glistening Phyrexian butt.

Planar Conquest is only available on the Mobile build at this time.