Type Words to put lyrics between the staves — one word per note (use - at the end of a syl-la-ble). Print: book size gives a real 9.2 mm staff like a piano book.
Pick a note value, then tap a piano key (or a letter) to write it — tap a rest to drop one straight in.
Each hand keeps its own count, so a left-hand note and a right-hand note that start on the same beat line up in the same column automatically.
Black keys work too — they are written with a ♯ or ♭ in front of the note.
No sound on an iPad? Check the side switch / Control Centre mute — iOS silences web audio when the device is on silent.

All 88 keys (A0–C8) — swipe the keyboard sideways, or use ◀ ▶ to move an octave, ● Middle C to jump back, and −/+ to fit more or fewer keys.
Blue keys are for the left hand (bottom staff). Red keys are for the right hand (top staff).
iPad with no sound? Tap the screen once, then check the mute switch / Control Centre — iOS silences web audio while the device is on silent.