You should go to this page and make new client.
- Application Name: Whatever you want
- Description: Whatever you want
- Website: Your site URL
- OAuth redirect_uri: Should be: Your_Domain.Com/register/instagram
How to install?
- Upload all files to your host and select merge if asked.
- Go to ACP: Install or Upgrade addon. You can found the XML at this path:upload/library/Nobita/InstagramAuthentication/addon-nobita_InstagramAuth.xml