Rename root module in android studio
I pressed Ctrl+Shift+F to search my current root module name and found the name to be in the settings.gradle file as rootProject.name=.... I renamed it and synced the project (File -> Sync Project with Gradle Files) and the root module name was updated.
In root of your projectopen setting.gradle and changerootProject.name='YOUR NEW NAME'
then close and restart android studio
Close the project. (File > Close)
Rename the root folder of the project.
At the welcome screen "Open an existing Android Studio project" and provide the new path.
On your link that's the second answer or see also here.