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To share an idea about a particular symbol you simply have to accompany your ideas with the appropriate cashtag. A cashtag is any Stock, Futures, or Forex ticker prefixed with the $ sign. This will work for most US and Canadian equities. Check out the supported Forex Symbols and Futures Symbols. To being sharing an idea click in the message box and type your message out.
If you are accessing the message box from a particular company's ticker page you will notice that the message box will automatically put the appropriate cashtag in for you. You can then begin typing your idea out before or after this cashtag or weave the cashtag around in your message to your liking.