Granting Posting Access To A Closed Community:
The command for adding a user to a closed community would be:
shared <sharedjournal> <action> <user>
where:
community = the initial command
<sharedjournal> = the username of the community
<action> = either add or remove
<user> = username of member to be added or removed
So, for example, to grant posting access to the user 'bms' to my community named 'communitytest', the command would be as follows:
shared communitytest add bms