Ok, I'm ashamed. I'm embarrassed. I can not for the life of me, figure out what the trinkets are used for, or how they can be equipped. I been looking around. I thought maybe it was a class specific thing, but I've check most of the various classes. I thought it might be an augmentation of some kind. Can someone please point out my glaringly obvious oversight, and put me out of my misery. Thank you.

If you double-click it, it will automatically go to the empty equipment slot. It goes in the range slot.

That makes sense then. I've just been throwing what ever bow I found in the slot for stats. That helps! Thanks Maelfyn lol