To update a second loadout, you must first level one of your characters to Repuation 1 (achieved through earning 20 levels before). After you reach Rep Level 1, you can customize three loadouts for your hero of choice.
To customize a second loadout, simply enter the Heroes menu, click your Rep 1 hero and press
. Then, enter customize, press
and enter the feats menu, then just change any of the default feats to one which you have unlocked by pressing
and scrolling to a different feat.