Hi Bob, welcome :)
This happens because the community is private and all forums within the community are invisible. So even though you were given access to the community, you were not given access to the forums within. I am certain that this is an oversight and that the owner is not aware of this. I've sent a private message to the owner to let him know, and I've also explained to him how to adjust the settings.
You'll probably have full access soon. Thanks for bringing it to our attention.