Jya.
Whenever you see anything in a post that you don't know how to do, quote them and click the wrench that's on a sheet of paper.
You can also set your messages to post like that by default, to do so click your name at the top of the page, select preferences from the drop down menu, and uncheck "Use the rich text editor to create and edit messages".
I'm not *entirely* sure what you mean by that so I'm going tonassusume you mean tagging people in posts.
To do that use [user="UserNumber"]PostGoesHere[/user]
It doesn't nest with as many things as /url *cough*mysignaturewouldborkifitused/user*cough* but regular text handles /user, and is preferable when linking to profile.
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Comments on Profile Post by Sir_Walter