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If you know the name of a contributor,
Put their name in the search bar, see what comes up.
If you are looking for something you have seen and want to return is different than if you want to see what's out there as topics of a discussion.
Go to the blue bar above, click on forum, look around.
Also, anyone can start a new question or discussion.
You can also, if you require extra help, type in your topic or question here and someone may research it for you, then get back to you.
If it's a general idea, as CWillie suggests you can also search on key words.
If it was the former, do you recall words from the title?
You can also try typing pertinent words in the "search site" box.
BTW, if you want to follow a thread without commenting you can hit "follow comments" below the original question/discussion.
This all applies to working on a computer, if you are working from a phone or tablet I understand things may be different.