How do I switch between different mechs?

I can’t figure out how to switch between mechs. Can someone help me?

Three ways: In workshop press the arrows on either side.
To equip a mech for battle you put check marks on which mech you want.
In battle there is a sign on the end of your bar that looks like a teleport, click on that and then you can switch mechs

Important note - the mech you check first (in the before-battle screen) is the one that goes first. So be careful with that… You can reset it by unchecking all of them if you make a mistake.