Just wait, and the Continue button will become clickable. Second window pops up, again wait and then click the continue button. Occasionally that second Continue button will be Exit and close the program, but then you just start it up again. Sometimes annoying, but the price you pay for not paying.
Under Networks in the initial window, or from the Network list add a network.
In the network add a server if one isn't already there, then edit it so it says "irc.swc-irc.com/6667"
Save it and connect.