Changing color of text in blog post

I have the rich blog plugin with a pavillon nop-template theme. I just want to add some custom css into the blog post source code and it doesn't appear on the real page (the changes does appear in the preview box on the edit page).

Something as simple as that  <h1 style="color:blue;">This is a Blue Heading</h1>

just to change the color or using Format -> blocks -> block quotes won't appear on blog page.

Any idea ?

You should ask Nop-Templates opening a ticket with them. They are very promt in their replies.