Need Help With Google Adsense

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I Had Made my blog and Just signed up For Google Adsense 5 Days ago. And i Had just Received E-mail From Google Adsnese Saying that My Blog Has ben veified For Google Adsense within the 3rd day of 5 Days. Iwas so Happy ,when i Got The e-mail. So i Quickly Logged in Google Adsense and Moved to the Gogle Adsense Setup page. And Then Went to My Blog site and tried to view my Page source.But i Couldn,t Edit it. I even used the WYSIWYG web builder. But it Also Couldn,t Get me th Adsense Code Pasted properly in it. Can any one Here Help me Out With it or Just Tell me which software Should i use for HTML Editing?