As Instagram has grown, like most social media providers their API's have changed along the way. A recent API change has broken Instagram feed on Websites all over the internet.
1. Update theme See How to update theme?
2. Update Nasa Core and install Smash Ballon Instagram Feed plugins, please follow these steps: Step 1 - Navigate Dashboard > Appearance > Click Install plugins
Step 2 - Click Update button from Nasa Core.
Step 3 - Install & Activate Smash Ballon Instagram Feed plugin
Step 4 - Connect your Instagram account
Go to Dashboard > Instagram Feed > Settings > Click to Connect an Instagram Account button.
Please Login & Connect to your Instagram.
Step 5 - Finish
After Connect Successfully you will get the Successfully Connect green notice.
Click Save Changes. Reload your site again and see the result. And now all done.