I didn't setup any POD when I purchased my NFCU CDs and was looking into how to do it after the fact because I have quite a few beneficiaries. You have to print out a POD form, sign it, and send it to NFCU, and it's limited to 6 primary beneficiaries, and you have to enter the SS numbers of the beneficiaries. I have more than 6, and I don't know their SS and would rather not provide that info. But being limited to 6 makes it a non-starter. And third, you also can't view this info online for any of the NFCU accounts to see what the current POD info is. It's generally disappointing and surprising for such a large credit union.
I don't think any of these 3 issues come into play with Vanguard or Ally Bank, for example.