For building you need a terminal emulator and nodejs(>v8). Proceed to working directory in your terminal and run "npm run build" command for building. After build process finishes you can upload and use it.
I tried to build it but got this error:
'react-scripts' is not recognized as an internal or external command,
operable program or batch file.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! email@example.com build: `react-scripts build`
npm ERR! Exit status 1
npm ERR! Failed at the firstname.lastname@example.org build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm WARN Local package.json exists, but node_modules missing, did you mean to install?
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\Charles\AppData\Roaming\npm-cache\_logs\2018-11-12T19_50_35_899Z-debug.log
A regular license allows an item to be used in one project for either personal or commercial use by you or on behalf of a client. The item cannot be offered for resale either on its own or as part of a project. Distribution of source files is not permitted.
An extended license allows an item to be used in unlimited projects for either personal or commercial use. The item cannot be offered for resale "as-is". It is allowed to distribute/sublicense the source files as part of a larger project.