Heroes 5 on a tablet.

Yes, just a mouse click. The game is quite old and wasn't designed for tablets, so there's no point in tapping the screen with your fingers. You need external devices: a mouse, a keyboard.

Gracias, amigo. The question arises: why doesn't the on-screen keyboard work, and is it possible to tweak something in the configuration files?
Otherwise, I'll have to buy a keyboard or mouse...