Type "@" and then start spelling the user name, you should get a popup with related user names (IanN, IanN1, IanN2); click the appropriate one
alternatively just type @ + username IanN and hit post
If the name has a space in it, like Pit Boss, sometimes you have to put quotes around just the name, so it'd look like "@"Pit Boss"" without the outermost quotes. Or maybe I should say it'd look like (@"Pit Boss") without the parenthesis for better clarity.
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