You need to have Gear cards in your collection to be able to change your space soldiers gear (weapons, armor, or helmets). If you want to equip your space soldiers with gear, here's what you do:

• Go to the MY TEAM screen
• Tap on a space soldier you want to equip gear to.
• Tap on the helmet, armor, or gun slot to bring up available gear cards.
• Scroll right or left to go through your available Gear cards, then tap the equip button is equip the gear to your space soldier.