how to add inline styling?

Hi.
I want to make some particular words bold. Using the editor turns to something like this:
1 <strong>example</strong>
Well this is what the highlighter is invented to do! But, is there anyway to make some words bold? Or originally add inline styling?
Sorry for my english.
Thanks.

http://ww.wp.xz.cn/extend/plugins/crayon-syntax-highlighter/