Preparation: Install the Client, Get Your Subscription Link
You'll need two things before starting. First is the client itself: on iOS, Clash Plus is the top pick, installed via the App Store, requiring iOS 15.0 or later—see the iOS section of the Download Center. Once installed, the app icon appears on your home screen; no account registration is needed to open it the first time.
Second is a subscription link. It's an https URL provided by your proxy service in your account dashboard, which the client uses to download a configuration file containing nodes and routing rules. Copy it carefully from start to finish—a broken link or a stray trailing space will cause the download to fail. If your provider offers multiple formats, choose the one labeled "Clash."
With both in hand, you're ready for step one. No part of this process requires manually editing any files.