If you want to get the blur censor that you see in different posts about the forums, the steps are simple...
First, you type what you want to type.
Second, you highlight the section of text you want blurred (the normal click and drag stuff, you know).
Third you click the "dot dot dot down-arrow" button above where you're typing and it will give you a dropdown menu, and from that menu you select "inline spoiler". You'll see the highlight on the text disappear as bbcode tags appear on either side of the (now) previously selected text.
Done, and it will look just like this text here.