Type:
[]
(before word or words).
[/]
(after selected text)
Text appears in between the sets of square (not curvy like these) parentheses-I get that mixed up sometimes & then wonder why it's not working.
Inside parentheses you'd first enter "u", "i", or "b", and then in second set insert "/u", "/i", or "/b". As in, [*]text[/*], except instead of * it would be a letter.
If you hold your mouse, w/o pressing buttons-just letting it rest over the part of screen where the "b", "u", and "i" appear-in the "post reply" window, it shows example of how to underline, italicize, or bold.
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*"I don't know what it is, but I know what it isn't."*