Problems backpress to the intro screen

My app is using the following web viewer for the intro screen. If I backpress in the current Web Viewer, will be directed to the intro screen.
I'd like to close the app after I've backpress twice and the notification window (ex: exit the app?) appears. I searched on the Internet and tried many ways, but it doesn't work as intended. How shall I do it? I want to know a good way.!

Use when screen 1 backpressed block

When backpress is set up, the white screen is displayed.

Show your blocks

Use true blocks before can go back block

Thank you. I solved it. It was my lack of understanding.

Which blocks solve this

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