Release shift (L/R) and tap HIRA (yellow button) will enter hiragana mode, which is your screenshot. You can type "あいしてる" (I love you) there. The 4th screen is when you tap SHIFT (hold L/R) again in hiragana, a.k.a hiragana supplement mode. You can type "げっぷ" (burp) or "じゅっぽ" (ten steps) in this keyboard. That's all! Nothing useful amiss.