Open either the Google app or Chrome browser on your iPhone. Tap the three-dot menu, scroll down and tap Search Screen with ...
The AI-powered feature, which lets you quickly search for whatever's on your screen, is rolling out to iOS users this week.
If you have a secondary Google account or a work Gmail ID, sign in to your Gmail email using the steps above. When you use Gmail as the primary email app on your iPhone, set it as the default app.