You can open menu by pressing (Ă©) or (0) it depends on your keyboard layout (by this i mean zero (0) on top of your keyboard)
Every Functionality needs Energy for functionality
(this is different Energy its not same as in your HUB)
Armor need to be charged it Armor Charger be wearing this armor and stand into Charged plasma
Each Part of armor gives you different ability
Helmet (Water Breathe / Night Vision)
Body(Plasma Shoot / Jetpack)
Leggins(Fast Swim / Slow Falling)
Boots ( none / Speed)
Plasma Shoot You can shoot plasma directly from your chest plate
by pressing TAB than you need to wait several seconds before CoolDown is gone.
You can see your cooldown in top of GUI
You can use two custom enchants at Body
Cheap Plasma 1-2 (this make each plasma shoot use less energy from your armor it depends at level of enchantment)
Better Cool Down 1-3 (with this enchant you will have shorter cooldown it depends at level of enchantment)
This is how you charge your armor