If you've already created the post in rich text, it will default to that when you are editing it. If you want to see plain text (and the html code) just click on the 'source' button.
Now I accidentally clicked on it and I have the same problem . . . and every time I go to the Update Journal page now, it loads the rich text editor, so I can't make any entries through the website without them being in rich text. How do I get out of that? The LJ FAQ claims that clicking on a link to Update Journal will bring me back to the plain text editor, but it's not true.
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HTH
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Go to http://www.livejournal.com/settings/?tag=editor and select plain text as your default editor.
HTH
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