Go to Settings > General > Software Update > Beta Updates and choose the developer beta.

IOS beta software For devices running iOS 16.4 or later Make sure to back up your devices before installing beta software and install only on devices and systems that you’re prepared to erase if necessary. Attempting to install beta software in an unauthorized manner violates Apple policy and could render your device unusable and necessitate an out-of-warranty repair. Registered development devices can be upgraded to future beta releases and the public version of the software.

This software is intended only for installation on development devices registered under your Apple Developer Program membership.

Overviewīeta software, also referred to as a preview, seed, or release candidate, is a version of software that’s still under development and not yet released to the public. Members can develop apps that take advantage of the latest features of Apple platforms and test existing apps for compatibility. Beta versions of iOS, iPadOS, macOS, tvOS, and watchOS are available to members of the Apple Developer Program.

Ipad beta profile