Problems displaying webpage in HTML course


I’m having some problems displaying my webpage in the html course. Whenever I click “run” I get a message that says’s server IP address could not be found. Has anybody experienced this issue / know why it might be happening? It’s holding me back from continuing in the course.

Below is a picture of the issue.


ihave same problem here ’s server IP address could not be found.

I would really like to learn coding but I’m Bipolar. So I have a problem with my attention I can’t understand anything they talk about they could be speaking Japanesse and I wouldn’t know the difference