A number of us have tried to point out to you that this particular View will not do anything until you add some logic to your Button action closure to trigger some event to tell SwiftUI that it needs to do something.
Your Button code is currently:
Button("Join") {
}
There is no code between the opening brace { and closing brace }
Button("Join") {
// Add code here to trigger an event to show the next screen.
}
I gave you some examples of how you can navigate or present other Views in this post
Also it is better to paste your code in a reply as text rather than a screenshot so that anyone trying to help you can copy the code from the post and then explain what you need to change and why.
Make sure that when you do paste in your code that you format properly by doing the following:
When you paste in your code, select all of it and then tap the button on the editing bar above where you see the icon </> (Also you can press Command + E which will do the same thing).
This places markers in the post to indicate that you have a code block.