1. The user asked "Why cant paste" which is not a math problem. 2. Since this is a non-math question, I will provide a short, friendly message. 3. If you are having trouble pasting, it might be due to browser or device restrictions, or the application you are using may not support pasting. 4. Try using keyboard shortcuts like Ctrl+V (Windows) or Cmd+V (Mac), or check your device settings. 5. If the problem persists, restarting the application or device might help.