Open Start and search for Environment Variables
Select Edit the system environment variables
Click Environment Variables
Under User variables or System variables, click New
Enter the variable name
Enter the variable value
Click OK
Click OK again to save
Restart Command Prompt, PowerShell, or the app using the variable
To set temporarily in Command Prompt, use `set VAR_NAME=VALUE`
To set temporarily in PowerShell, use `$env:VAR_NAME=”VALUE”`
To set permanently in Command Prompt, use `setx VAR_NAME “VALUE”`
To set permanently in PowerShell, use `[Environment]::SetEnvironmentVariable(“VAR_NAME”,”VALUE”,”User”)`
To verify, run `echo %VAR_NAME%` in Command Prompt
To verify, run `$env:VAR_NAME` in PowerShell