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I can't replicate the issue you're reporting, when I log into your Sitebuilder directly to check things. Everything seems to be fine.
I'm afraid what you describe sounds like you have inadvertently downloaded malware to your computer, adware to be specific. This domain ad isn't produced by Yola. Another option is that the ad comes up because of custom code you added to your site, however, the problem didn't occur on my end, when I opened your Sitebuilder. Please check your computer for malware and remove it, which will most probably solve the problem you're experiencing right now.