1) Exit the IDE
2) Rename the [xxx].B4a file (and possibly also the xxx.B4a.meta file) to the new name
3) Double-click the new xxx.B4a file to load the newly named project
4) Change the values for #ApplicationLabel:, #VersionCode: and #VersionName: in the "Project Attributes" section of the "Main" code module to a new name/version
5) Change the package name by selecting on the IDE menu: Project...Build Configurations...Package
6) Save project