I am unable to post the discussion in the CORRECT IN PLACE. there it shows as In a Place Reach a specific audience or organize your posts by subject or group..
please suggest how to do it .
This question seems more appropriate for the Community Feedback (No Product Questions) space, since the question is about the community and not a General Database Discussion.
Said that, I do not fully understand the problem. If you want to ask a question or generate a discussion on a space, you have to
1) go to the desired space (in this case, I choosen this space:
2) Once on the space, just select the "Start a Discussion" option in the Actions menu
3) the "In a Place" option is automatically selected: