1. How to play with friends?
You should be on the same Location (AF, AS, EU, NA, OC or SA) and start game simultaneously (press Play at the same time).
If you both selected same Game Mode (Mining, Duel, Domination, Energy etc.) the Matchmaker should bring you and friends in the same Game.
2. Desktop keyboard keys in Battle:
E - Activate Super Ability which can be activated (The Eye, Shield).
C - Crouch.
V - Change shoulder camera view (useful to watch behind corners).
Esc - Open / Close Menu.