The Web Application does not require installation as it is cloud-based. You only need to visit your go-to-page (https://followmystaff.com/), use your credentials (Username, Password) and you’re all set!
As for the Mobile App, all you have to do is download it from your device’s respective marketplace (PlayStore or AppStore), enter your Guard ID & PIN (if a PIN code has been set by your Administrator) and you can get started!