./minerd --url=stratum+tcp://stratum-eu.aln.luckyminers.com:3331 -u Username.Worker -p PASSWORD
But change the username settings offcourse!
You can fine tune minerd mate. You can read the getting started page http://aln.luckyminers.com/index.php?page=gettingstarted but only tweak once you know it's working, so thats after launch or tomorrow like i would recommend! For now, connect and gets as many coins as possible when it launches
Also please download the latest version of CPU miner/minerd which does support stratum. http://sourceforge.net/projects/cpuminer/files/. Older versions are using getwork and that protocol will be dropped (by the community) since its not as efficient.
You would be suprised how many people are still using an outdated version and can't connect.