I haven’t updated the Ted2Go IRC client in some time, so it might be a bit busted heh.
This is likely due to the server you’ve been assigned, you should be able to connect later via Ted2Go and be assigned a different one.
But I recommend using something like Hexchat on Linux to connect to Freenode and join #monkey2.
You can grab it for free over at: https://hexchat.github.io/
That way you can stay connected outside of Ted2Go as well. 
But if you desperately want to use Ted2Go’s IRC, you can jump into settings and change the server to a specific Freenode server, instead of connecting to the network and being assigned one based on location.
Here’s a list (not sure how updated it is though): http://freenode-redesign.herokuapp.com/irc_servers.php
There’s also a web based solution, look at my first post in this thread.