A "Settings" button should appear on the right hand side just above the listed members once granted moderator status. Click this button. On the right you will see three options. "Settings", "Moderators", "Invite".
In settings you will be able to edit the community description, add a community location, and add/change the logo or banner image.
Under "Moderators" you will be able to add an existing member as a moderator.
Under "Invite" you will be able to invite new members to your community.