It can be done
You can remove that extra space and start over again. Go into the Layout of your particular blog and choose the page element you want to make changes to and you have the choice of removing that page element. Do this.
Once you have the correct google code, choose to 'add page element' and paste in the code and save your changes.
Make sure you have the correct Google adsense code that you're ready to paste in that page element.
Renee
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