Docker must be installed in your desktop. Follow the instructions at Docker to install the same.
First download the desktop application instsaller from the Gigahex website and install in your disk.
Once you've installed, you'll be presented with the login screen as shown below.
Login with your Google or Github account, and once logged in you'll be able to create a workspace that will help you to manage your development environment.
Gigahex is currently available for Mac only.