There are a few ways to increase augment slots in PlanetSide 2 NGS. The first way is to purchase the expansion pack, which comes with a set of five augment slots. The second way is to find and activate augment nodes. These can be found throughout the game, and provide players with a set of augment slots.
The final way to increase augment slots is to level up your character. This will grant you additional augment slots as you progress through the game.