Connection to domain environment is available only for windows 8 Professional and Enterprise..
Go to computer properties (Control Panel\System and Security\System) and click on advanced system settings..
Then select computer name tab and click on change button..



By default windows 8 is connected to workgroup called WORKGROUP . Type the workgroup name you want to connect...




Click "ok" . ok. and "finish".. .. You will be promoted to restart... That's it...