Once your Engine finishes compiling (or downloading, if you are using launcher) it's time to start it:
Engine\Binaries\Win64folder and double-click on
You might experience long loading time when you start the Engine for the first time after compiling. This is because Unreal Engine will optimize the contents for your platform to derive data cache. This is a one-time process.
After the splash screen, you should now see the Unreal project browser. Perform ...