To build/rebuild virtual server buildBuild/rebuild virtual serverand Manage public templates permissions must be enabled. This is a new permission which manages build/rebuild functionality independently from update virtual server permission which used to regulate the build/rebuild options in the previous versions.
If you haven't checked the Build Virtual Server option during the VS creation process, you will have to do this manually after the VS has been created. Building a virtual server is the process of allocating physical resources to that VS.
To build a virtual server manually or rebuild the VS on the same (or another) template: