On first run, macOS will ask for permissions:
Go to System Settings → Privacy & Security to grant these.
Run the app, look for 🎤 in your menu bar, then hold Ctrl + Shift + R and speak!
Make sure Accessibility permission is granted. Go to System Settings → Privacy & Security → Accessibility and enable Speakform.
This means Accessibility isn't granted. Add the app to System Settings → Privacy & Security → Accessibility.
Check Microphone permission in System Settings → Privacy & Security → Microphone.
Accessibility permission is needed for auto-paste. Also ensure the target app accepts paste commands (Cmd+V).
Speak clearly and at a moderate pace. Background noise can affect accuracy. Try recording in a quieter environment.