I've done that but getting the response below;
Hello
kingmonster82@gmail.com,
We're writing to let you know that the group you tried to contact (wazua) may not exist, or you may not have permission to post messages to the group. A few more details on why you weren't able to post:
* You might have spelled or formatted the group name incorrectly.
* The owner of the group may have removed this group.
* You may need to join the group before receiving permission to post.
* This group may not be open to posting.
If you have questions related to this or any other Google Group, visit the Help Center at
http://groups.google.com/support/?hl=en_US.
Thanks,
Google Groups