[support] Simple Organic Groups question1

I am going nuts trying to find out why I cannot see in the blocks list a block for group homepages. The OG manual speaks of: "A block is shown on the group home page that links to these group specific posts and actions. The block also provides summary information about the group." But I cannot find that block in the blocks list, or how to enable it. Can anyone help? I am assuming the path to the group homepage is simply the node id? Thanks in advance Edward Peters Oxford, UK www.iofc.org