Users are stored as a JSON array in your Netlify environment variable INTELX_USERS. Use this tool to build the value, then paste it into Netlify.
Copy this entire value and paste it into Netlify → Site configuration → Environment variables → INTELX_USERS.
Copy the value above
Go to Netlify → your site → Site configuration → Environment variables
Find or create INTELX_USERS and paste the value
Click Save — changes take effect on the next deploy. Trigger one via Deploys → Trigger deploy.