how do you unlock more warframeweapon slots?

unlock slot
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How to Unlock Weapon and Item Slots · Unlock 3rd Weapon Slot: Your 3rd Weapon Slot will unlock after leaving Pandora for the first time,

unlock and collect the box from said station as it passes said station 21 slot when the car is travelling comprising pivotal spring tensioned

unlock 2nd insured slot dmz Level 2 3 Level 1 Spell Level 1 Spell Slots Unlocked: 3: You gain an additional Level 1 Spell Slot Spells Learned: 8: Learn 2 additional 1st Level

unlock second insured slot dmz Your Class Mod Slot will unlock after helping Rhys out on Promethea and defeating the boss and completing the quest 'Hostile Takeover', which is