how to grant Admistrators and NetworkService full access to ContentSubmitters group ?

Hello Everyone, I am trying to follow this guide here :

http://support.microsoft.com/kb/2807668?wa=wsignin1.0

how can I grant Admistrators and NetworkService full access to the group?

the group is on Active Directory , NetworkService I assume is a local exchange server account ?

I am missing something here ..please help... Thanks.

=======

Method 1

1. Create a new Active Directory group that is named "ContentSubmitters," and then grant Admistrators and NetworkService full access to the group. This is a dummy group and should be used as a placeholder only. You might want to add a description so that the group is not removed. 
2. Force or wait for Active Directory replication.
3. Restart the following services:
   • Microsoft Exchange Search 
   • Microsoft Exchange Search Host Controller