У вашего броузера проблема в совместимости с HTML5
Learn how to easily download and install Instagram on your Android device.
Instagram, the photo sharing service works best on mobile devices. To install it on your Android device, go to the play store.
Search for 'Instagram'. Select the Instagram app from the results.
When the Instagram page opens, tap on the 'Install' button.
Allow Instagram to be downloaded and installed on your device.