What is the best way to use Supplier Onboarding "Editor Mode"?

As of PUM33, there is an “Editor mode” available for authorized users to make changes to supplier, or internal user submitted supplier registrations.

To be able to access the registration in “editor” mode, it appears the registration must be in E (Pending Editor Review) status, or B (Request Editor More Info) status.  By what means does a registration get into one of these status’?  Is it necessary to Create an approval step that routes a supplier registration to a “Reviewer” in order to be editable?  Is that the only way?  Can a request be sent back to a reviewer after it has already reached “pending approval” status?