Dog Calm & Relax Kit

Tap the actual Share button at the bottom of your Safari browser (looks like ⎋ or 📤, on your phone screen outside this box!).

Scroll down in the browser menu that appeared and select "Add to Home Screen" (with the plus ⊞ icon).

Tap the actual menu icon ⋮ (three dots) or the install icon in your address bar (on your phone screen outside this box!).

Select "Add to Home Screen" or "Install App".