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You can either edit your pages directly from the back-end, by going into:
Depending on what exactly you want to edit, you may need to edit the template files that are in your current theme’s folder.
If you want to to edit inline (directly on the pages of your store) - you need to turn on Inline Editing:
System>>Configuration>>Advanced (left side nav, bottom)>>Developer>>Translate Inline.
Enable it here, click Save on top, and browse your store from front-end - click on the little book icon to edit what can be edited. Remember to turn it OFF when done!
To see WHAT you need to edit, and where all the files are located, do as above, but once you are inside the Developer menu, change the view from Default to your current store under “Current Configuration Scope” (top left), and a new sub-menu appears under Developer>>Debug. Turn “Template Path Hints” to YES, save, and browse from front-end again.
Hope this helps!