You can install the My Hours smartphone app free of charge:
at Play store for Android devices: https://play.google.com/store/apps/details?id=com.myhours.Spica_MyHours
at iTunes store for iOS devices: https://apps.apple.com/si/app/spica-my-hours-pro/id1532035406
Once you download the app, you sign in with your existing email and password to access your account.