I also tried adding the style into the box marked
however when I do that the toolbar disappears from Tiny MCE.If you leave the field empty, TinyMCE will parse your CSS file and list the styles contained in it to the user. If you want only some styles presented to the user, specify them in the form "CustomName1=style1; CustomName2=style2" in the first field below.
I'm using CMS Made Simple 1.3.1 with the default Tiny MCE that downloads with it.