In order to use Tailwind for Instagram's Auto-Post feature, you'll have to convert your Instagram account to a Business account. This requires you to link a Facebook page to your instagram.
Read more about setting up Auto-Post for Instagram in our Knowledge Base article: How do I Automatically Publish posts to Instagram?
If you wish to change the Facebook page that's connected with your Instagram Business profile, please follow the instructions below.
On Your Phone
Open the Instagram app
Log into your business profile
Tap Edit Profile
4. Under Business Information, tap Page
5. Select the Facebook Page that you wish to associate your business profile with
Log into Tailwind and switch to your Instagram profile
Click the banner at the top of the screen to reconnect Tailwind with Facebook and enable auto-publishing using your new Facebook page
Voila! You're done! Your new Facebook page is connected to Instagram for Auto-Post!