Clink takes about a minute to set up. Install it from the App Store, open the app, and it walks you through the two steps below. Or do them by hand:
1. Open iOS Settings → General → Keyboard → Keyboards → Add New Keyboard…, and pick Clink from the list.
2. In any app, tap into a text field, then hold the 🌐 globe key on the bottom row of the keyboard and choose Clink.
iOS remembers the last keyboard you used per app, so the first day may take one globe-key switch in each app. After that, Clink comes up on its own.
Optional: back in iOS Settings, tap Clink and allow Full Access. That unlocks haptics, clipboard history and custom sounds. Everything else works without it. See “What Full Access actually does” for exactly what it means.