when it activates....i'm guessing it's working....there's nothing i have to do to get it work is there...not sure what they're talking about in regards to slotting the power since there's no slot for it......i'm also using invulnerability, could that be a problem.

You can only use one passive defense at a time. If you took invulnerability before you took PFF, then PFF is not slotted. (Slotted passives appear in the extra little spot at the top of your hotbar).

The graphic for PFF (when it's slotted) only appears when you are actually taking damage -- it basically looks like a clear shield that is molded to the contours of your body.

I thought it also looks like colors flowing up on your body. Basically, Red, Yellow, blue depending on the amount of shield that is left....

PFF shows up when you take damage and glows the color that you set it, but as said if you have invun then it wont be slotted and so not showing up.

You can tell if PFF is on if you're pwning everyone's face in PvP.

Also, you can only have one slotted passive. It's in the little slot all by itself above your two action bars. Get rid of invul or PFF.