Nothing happen..why R shiny not working

The bussy icon suggest the app is runing , but it is an empty app so there is nothing to show, what are you expecting to see?

but from the tutorial. there will always popped up browser..mine no popped up...is there any setting for the popped up browser...sorry for the grammatical error

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I have tried to run my first R shiny app by following the basic tutorial. But based on the picture, it shows that the app is starting and there is no message like listening port etc..

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I expecting to see this kind of message. (this picture captured from YouTube tutorial)

Thank you in advance.