i can’t send messages

Try using the full keyboard instead of the floating keyboard.

To easily return the new Floating Keyboard to the normal on-screen keyboard presentation, use the two-finger “zoom” gesture (i.e., the reverse of the two-finger “pinch”).

If the Split Keyboard is restored instead of the full on-screen keyboard, you can either use two fingers (one on each of the two half-keyboards) and swipe the two halves together - or touch-and-hold the “keyboard” key, then slide your finger to the Merge & Dock option and release.

Use the floating keyboard on your iPad – Apple Support

Split and move the keyboard on your iPad – Apple Support

Can you post a screenshot of the problem?

Take a screenshot on your iPad - Apple Support

You can upload your screenshot (having first redacted any personal information using markup tools) using the image button at the bottom of the message editing window.