how to download IOS 10 on my phone iphone 4 im struggling

iPhone 4 does not support iOS 10. The latest version compatible with iPhone 4 is iOS 7.1.2.

If you're not on this release, it is recommended that you update. However, you cannot update further than this.

We are sorry, but iOS 10 is not currently supported on the iPhone 4, thank you for coming to my ted talk. [APPLAUSE]