Turns out this Aruba pdf doc must have been somewhat old. I found that to link Instant Access Point (IAP) to AirWave (AW), all you have to do is configure IAP by going to System->Admin and fill in the AW section in upper right. The "shared key" field is unique to IAP - there is no corresponding field to fill in in AW, which had me confused for a bit.
As far as support on this forum, so far I have found it to be disappointing. Rarely do users ever reply, instead just some Aruba staff (which I am thankful for). But there's a lack of followup even from Aruba staff :(
Anyway, this one was resolved by me calling into HPE support...