Board Game Arena

I am not a long-time player of this game, so I don't think this is a bug, I think it's just me not understanding the mechanics.
If I want to have an infantry unit stay still but attack, how do I accomplish it?
Say I have a card that allows me to command 2 units in a sector. I choose both those units. Then it has me move. Is there anything special I need to do with a unit I want to move zero but still attack?

Thanks in advance.

You have nothing to do with the unit just click on end of movement phase (or something like that).
It is the same (I think) if you don't want to attack for some reason.