After you create your pipeline, you have to make sure that is parametrized. Check the This project is parametrized option in the Pipeline’s configuration and add 2 specific ones, which values would change depending on (in this case) your external server for deployment:

Those ones will be used as variables on the Jenkinsfile, that is way naming here is important.

The only thing left here is paste the content of the provided Jenkinsfile in the Pipeline section, always according to the kind of your project (Angular or Java).