Right now it is extremely hard to connect to DALnet, and we have no idea how long that will continue. To pick another network to connect to, in the window where you click Connect, beside the line that says Random US DALnet, there is a small upside down triangle. Click on that and you will see other Randoms listed, pick one of those. Or, if you know a server you want to connect to, close that window and in your status window type: /server whateverserver.net
For example, if you wanted to connect to one of EFnets servers, you could type /server irc.Prison.NET
This web page
compares many networks and links to server lists. Keep checking back on the thread here that says Update, as info is recieved, its being posted there.