Unless you have changed the edit settings online you can't edit it via the dashboard theme editor. I always edit mine via Dreamweaver on my computer and then upload - you can do the same with notepad or any other editor for html. I recommend you do that anyway so if you muck something up you can undo the changes you did. Doing it straight online runs you into the danger of not being able to undo what you did, but if you really want to do that, you need to change your settings to 777 I believe for editing online in your control panel for file editing.

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Kathie M. Thomas, VA Coach
A Clayton's Secretary, VA Blog