I already have an AVIS Preferred account.
I just got a Priority Pass. It says I can use it to get AVIS Preferred PLUS.
However, I can't figure out how to add this to my avis account. All the instructions refer to signing up for a new AVIS account.
In my existing AVIS profile, I see no where to add a PP number.

Email AVIS, they just repeated instructions on how to signup or login