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Thank you for that helpful suggestion: "Additional comments can be encouraged by "mentioning" someone like this: @Questionasker. If successfully formatted as an "@ mention" that user name should turn blue."

Where would I "mention" someone in that manner? Would that be done in a reply to the post I am seeking further response to?  Would it be a reply to my followup question, or would it be a reply to the other person's original answer for which I am seeking a clarification (from them or anyone else.)