If your talking about the message shown in the attached image, that means your device isn't compatible with the application. Usually this is due to the OS your phone is running (Gingerbread, ICS, Jelly Bean, etc.) Your only option is to look for a comparable app that will work with your phone.
Instagram states: Works with Android versions 2.2 and above that support OpenGL ES 2
It's possible your phone doesn't meet one of those two criteria.