Alert Pop Up Notification Box

For the life of me I cannot figure out how to create a simple Alert Box Pop-Up Notification. An example can be found on this page:

https://ui.vision/demo/storeeval

I want the pop-up like the one found on the page called Confirm to pop-up with a question “Is everything on the page correct” No the script pauses Yes the script continues

Use command PROMP

Here info