Granting Curator and Expert Roles
Community owner can grant Community curator and expert roles from the Members tab in communities.
To grant these rights the corresponding check boxes should be enabled. These can be enabled only after clicking the Edit link
Click Edit to grant curator and expert roles
You can specify Global curators in Central Administration > Service Applications > NewsGator Social Platform > Manage Global Q&A Curators.
For further details, see the Manage Global Q&A Curators section.
Global Q&A Curators section