When you integreat with WordPress than Q2A will autometically consider WordPress permission and so
WordPress User Level
|
Q2A User Level
|
Administrator
|
administrator
|
editor
|
editor
|
contributor
|
expert
|
All below
|
Basic (just registered user)
|
and so if you want to make anyone as an expert for Q2A than you need to set that user as contributor in WordPress and Q2A will modify permission accordingly