Here it is.
To allow 10.0.0.85 everything (IP must be static, if you want to use mac address than use arp instead of src).
acl ammyadmin src 10.0.0.85
http_access allow ammyadmin
Or allow 62.75.223.96 to be accessed by all.
acl ammyadmin dstdomain 62.75.223.96
http_access allow ammyadmin
Read more about squid here...
http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch32_:_Controlling_Web_Access_with_Squid