While more than one Google Account can verify a website URL, only one account has the right to upload and publish products via Google Merchant Center for a given website. VersaFeed will be creating and uploading your data feeds to this claimed account.
Once you have verified your website URL
with Google Webmaster Tools you can now claim your website in Google Merchant Center:
More info from Google »
On the left-hand-side go to: Settings > General
Under Website URL, enter your website URL.
Click Claim this URL to claim the website.
Click Save Changes.
You should see "Verified and claimed" displayed under your URL.