How do I stop Apple from using my information for training purposes?

Try the following:

1. Open Settings
2. Tap Privacy & Security
3. Tap Analytics & Improvements
4. Tap to toggle off the features you want

Good luck! 👋🏼😉

You can stop submitting anonymous data for their analytics by opting out in settings, but only if you opted in previously, like when setting up your device. If you are talking about Apple Intelligence, Apple will not use your information.