The integration between Blipp and ISN is handled entirely within the Blipp program!
Once you sign up on their site: https://www.blippreviews.com/
You can then navigate to Settings -> Integrations (inside of Blipp) where you will need to enter your ISN company key and access keys.
Our article on obtaining those keys is here: http://help.inspectionsupport.net/isn-working-with-other-applications/access-keys-in-the-isn-3rd-party-access
That's it! When inspections are completed in ISN Blipp will then send out an email to your clients asking for a review!
For futher questions on the integration process, please reach out to Blipp Support: https://www.blippreviews.com/