Open todo4teams in your internet browser, e.g. Microsoft Edge or Google Chrome using your company's todo4teams environment, e.g. https://todo4teams.yourcompany.com.

Note this icon in the browser's address bar:  showing that this application is ready to be installed as a PWA.

Click it to open the installation dialog. Click "Install":

todo4teams will open in a new window, now with the appearance of a native application.

Click the "..." icon to see the followinf dialog and choose if you want to create shortcut entrys in the start menu, the taskbar or on the desktop: