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.
You will be given your share page URL after you create a share page.

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:
Paste your ShareProgress into BSD Tool's Thank You Redirect Options to set it as your after-action page.

Don't forget to save your petition!