Substituting [ for ( and ] for ) (i.e., square corners rather than rounded), you copy the text that you want to highlight, and
(quote)text(/quote) or, optionally,
(quote=“whomeveryou’requoting”)text(/quote)
There are many other nice HTML tricks, such as (spoiler) for text that is to be hidden unless the reader clicks on it, (b) for bold, (u) for underline, (i) for italic, etc.