Make sure you have all the numbers right, and you don't have commas for the periods. You should be able to access the server through Commander. The server name isn't going to show up on Commander or be searchable for a good while. You will have to enter the IP and port numbers in the appropriate boxes in the upper left corner of the DayZ Commander favorites screen, then click "add to favorites". The new address, instead of the server title, will show up in a line in the favorites section. Just click on that as you usually would to start the game. You will have to go to the favorite section each time to join.
If not you might have to do it the way Mongo posted, through Arma's built in launcher.