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Well, it looks like you have figured out how to post a Blog. Posting a Discussion is very similar. I suggest that you check in the Forums and see if there is already a discussion that addresses any question you have before posting a new one though. Always check the date of any discussion before replying because if a discussion is over a year old the info may not be current.
Join the groups I left for you on your My Page. Once you have joined a group (go to the group--group names in my comments are clickable links--and click +Join in the upper right), then you can add comments within the group. I suggest you click "Stop Following" after posting in Groups so that you do not get lots of emails if you become a member of a very active group. You can click on GROUPS above and then My Groups after logging on and check to see if there has been any activity since you were last on.