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If your question is related to changes you want to make on your instance, you can try the Redactor Composer Plugin, it works with bbcode if i'm not wrong, that is it would support what you're looking for: https://community.nodebb.org/topic/6093/official-redactor-composer-now-available-in-0-7-1?_=1469356029163&page=1
yariplus Community Rep
There are several plugins that add color, such as
mega-colors, as well as one of my own
Both add a button with a colorpicker, so you don't need to know the color syntax.