First create your ShareProgress page, then paste your share page URL as your "Redirect URL" in Blue State Digital (BSD Tools).

After you create a page on ShareProgress, you will receive a url for your newly-created share page. Highlight this url and copy it on to your clipboard.
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With that URL copied, log into your sign up page or advocacy campaign on BSD Tools. Click on the section labeled Thank You Redirect Options. Select Redirect to URL in the dropdown menu and paste your share page url in the field labeled Redirect URL:
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Don't forget to save your petition!