If you have successfully installed your app using the installation URL and have accepted the necessary permissions, then it should be visible in the Connected Apps section under Integrations in your test account.
If you are unable to see it there, it could be possible that the installation process was not completed successfully or there could be an issue with the app configuration.
To troubleshoot this, you can try the following steps:
Double-check that the installation URL is correct and has been copied correctly.
Verify that the app is configured correctly, including the permissions requested.
Check that the test account you used for installation is the same as the one you are checking in the Connected Apps section.
I hope this helps you, and please feel free to ask any further questions you may have.