To install on iPhone or iPad: tap Share, then Add to Home Screen.
To install: open this site in Chrome, tap the browser menu, then Install app / Add to Home screen. Install needs a secure address. Open https://opus.ni-systems.co.uk in Chrome — not a local IP, and not after bypassing a certificate warning.
This page is not in a secure context, so Android will block install. Use https://opus.ni-systems.co.uk in Chrome.
Use your Opus Homecare account details.