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Another tip to share with you when selecting and modifing themes, is to add a theme block that only you can see when logged on. This makes switching easy for you while you make changes and keeps your site clean for your users. When you are all done, just go to admin>>preferences>>General Settings[edit] and set your newly modified theme as the default.
This way users don't see changes as you make them until you want them to be seen and you are happy with your edits.
Cheers