When the Review summary modal appears, click the Create button to create the app.
Once the app is successfully created, go to Settings > Basic Information and copy the Client ID and Client Secret from the App Credentials section, then paste them where needed.
After entering the Client ID and Client Secret, click the Next button.
You will then see a page like the one below confirm that the channel you want to connect to is correct, and click the Allow button to complete the app connection.
Log in to your Slack account and navigate to the authorization page.
In the top right corner of the authorization window, select the channel you want to connect. If you do not have permission for the channel, the Allow button will be disabled.
Click the Allow button to create a new app connection. Click Cancel to cancel the app creation.