"Add to Home screen" is a feature available in modern browsers that allows to "install" a progressive web application as a standalone app to the device's home screen.
Administrators can install Spacebring on their device's home screen.
Users can install the Member Web Portal on their device's home screen.
How to install web app to home screen
Open Spacebring or Member Web Portal in your browser.
Follow the guidelines for popular platforms to install it to home screen:
Safari on iOS or iPadOS
Safari on macOS Sonoma: open the web app, press File > "Add to Dock..."
Google Chrome on computer or Android.