How do I add a new Product Owner to a Product in Support?

How do I add a new Product Owner to a Product in Support?

I have support reps but I'm the only person available to add as a Product Owner to a Product.  I'd like to do two things:
  1. Add a Support Rep as a product owner to some products
  2. Add someone else on our Zoho accounts (a CRM user) who is NOT a Support Rep, to other products