Add the appropriate Hosting user account to either the GEUsers or GEAdmins user group via the GE User Administration icon. 

If the user will be syncronizing GE data with other Hosted Blackbaud products, they will also need to be added to the GESecure group as well.
 
NOTE: By default, the GE User Administration icon is accessed by logging into the [SiteID]GEUser1 account.