I am a Free-to-Play player. I noticed that several of my trait slots are "open" and available to place a trait inside them (2 Virtue Traits, 1 Race Trait and 1 Class Trait). I also have "earned" several traits (like Charity), according to the descriptions of the traits on that screen. However, I see no way to actually place Traits into open slots. Is there a trick to this? My character is Level 16.

Thank you for any and all help.