To connect your Instagram feed to be shown on your public profile:
Go to Profile
Go the the Photos tab
At the bottom, under your albums, there will be a button to connect your Instagram account:
Log in to your Instagram account and give the app access
You should be redirected back to your profile. Go back to the photos tab and if successful, your Instagram feed should now be connected
Visit your public profile to see your Instagram feed at the bottom
To disconnect your Instagram account:
Go to Profile
Go the the Photos tab
At the bottom, under your albums, there will be a button to disconnect your connected Instagram account
Instagram feeds are only available for premium and elite subscriptions