Return to the first card of the stack, and find your way to the native controls part of the MobGUI window.
Drag the Browser control onto the card window. It's the one with the thumbnail showing Google's search page.
Resize the control to fill the width of the card, and its height to fit between the tab bar and a little way below the NavBar. Give it the name Browser.
With the browser control selected, check the box in the MobGUI window titled Auto destroy on closeCard. This will help reduce the memory usage of the final app during the times you're not on the browser card.
Drag a native Text control into the gap between the browser control and the NavBar. Name it
url, and resize it to be nearly as wide as the card, leaving space for a Go button on the right.Drag a Button control into that space, set its label to
Go, and resize it to look nice. You can Option/Alt-double-click to have it space itself a standard distance from the right of the card window...