All the current Apple product users starting from iPad 4th gen to iPhone 6S Plus, can access the iOS 10 beta.
To install this update on your device, you need to visit the public beta website. You can sign in using your Apple id and then click on Accept, below the Agreement page. You can download the profile after you select iOS tab and enroll the iOS device link.
After downloading the update, make sure that you reboot your device. Once it reboots, you can then go to settings, then tap on general and then software update. Follow the screen prompts from here until the last step to download iOS 10.
Once the update is installed, the beta version will allow the users to test most of the revamped apps such as iMessage, Apple Music and lock screen widgets. Don't be surprised if the update has bugs because iOS 10 is still a public beta version.
Reports, however, indicate that the users should avoid installing iOS 10 beta to their device yet. If you must test the update, then use it on a spare device. iOS 10 beta is stable to use and when the update launches, the users will be able to use many third party apps on their device that are not yet available on App Store. Facebook, AirBnB, Camera+ and other such apps will also be updated to iOS 10.
