How to perform standard attack with Tap controls?

I’d like to know how to perform a standard attack without needing mana. I can’t seem to find a regular attack button. I’m playing the tank.

from what i know…i don’t think there is an attack which doesn’t need mana…or rather there is no ‘standard attack’. there are just skills. but there are procs, although you would still need to use mana for the skills to activate most procs