If you point your browser to http://anything.example.com, you should see your website as usual.
If you see it, your DNS and Apache settings are fine. Congratulations!
If it is not please enter "ping anything.example.com" in command line. you should see IP address of your server. If not, then the problem is in DNS setup. Go back to DNS configuration step.
If ping command shows correct IP, likely there is a problem in Apache. Please follow Apache configuration manual.