If you use the "raw text" blue button at the bottom of a post you like you can see exactly what they entered.
All the codes are under "UBB Code is On" to the left when you are creating a post.
In the case of the blue box all you do is surroung the quote in [ qs ] [ /qs ] (but leave the spaces next to the [ ] out. Thus: [ qs ] test quote [ /qs ] will procduce