Press Vol Up to scroll back to the previous post.
Press Vol Down to scroll to the next post.
Quick double-press Vol Down to like the current post.
Hold Vol Up to open comments. Use Vol Down to scroll through them. Hold Vol Up again to close.
Download and install the APK on your Android device.
Open InstaScroll and tap Open Accessibility Settings.
Find InstaScroll in the list and enable it.
Open Instagram. Volume keys are now remapped — only while Instagram is in the foreground.