Use the on-screen numpad, select type, category, date, and comment, then tap 'check' button.
To edit, tap on a transaction to open the edit screen. Make your changes and tap the 'check' button to save.
To delete, tap and hold the backspace button in numpad until the icon changes to a trash can, then release it.
After signing in with Google, go to Backup & Restore settings screen and tap "Backup". You can also enable automatic backups.
After signing in with the same Google account, go to Backup & Restore settings screen and tap "Restore".