Explain how to change the name of the jar

[avh4]

The guide explains,

"The libs folder should contain a JAR file that is named after the project’s folder. If you cloned the project from GitHub, then the JAR file is likely named initial.jar. That’s probably not what you’d want it named, though."

But even though "that's probably not what [I] want to name it", the guide doesn't tell me how to change the name of the output jar!