I had good answers for the questions I posted, once I left that page, I hardly retrieve it. so how can I find the questions/answers I posted?
You can click your name or hit this https://community.hortonworks.com/users/2338/robindong2000.html
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Go to your profile. You would see all the questions you posted there.
Select questions under your name
@Robin Dong Your profile page has complete history of your actions "audit"