Make sure you are allowed to post html (admin/prefs/text rendering).
(wyswig enabled? In the editor you (most right) have < code >
Enter here. In field just plain post the text as posted above. No more, no less.
Watch! it should give a 'post' as a rectangular greyish field (that would be the good piece). (wysiwig mode) NO TEXT!!
After saving and calling it should display as :
In plain editor : just post the code..