Register an account on https://sphere-engine.com/ . You may need a non-public email ID to register and activate your account at the above site. Activation is done by verifying email. Once your account is created you are all set to setup SphereEngine.
Download & Activate
Post installing and activating the WPLMS Sphereengine plugin. Go to WP admin - LMS - Settings - SphereEngine tab.
Widget Hash ID
Login to your sphereengine account and locate widgets. You will need to click on "Create widget" if you have not created any widgets earlier.
Add this widget hash ID to settings in previous screen.
Compilers & Problem Token / API / API Address
Go to your spherenegine account and locate API Tokens. Inside this you should be able to locate the compilers token API and API ADdress along with the Problems API.