As the title suggests I'm struggling to find how I burn my own Militia when it's in my hand during the purchase phase in order to reduce the cost of my next troop purchase.

I was reading another thread that suggest you can tap it from your hand and it will activate and you are looking at adding an action button when the Militia is zoomed in but neither work for me.

I only just go this game but reading the rules I believe I should be able to do it on my first turn as the barracks character.

I've tried on a android tablet and android phone.

Any help would be appreciated.