You should leave the default server address:
127.0.0.1:4237
The main launcher is being redesigned and the new version will be simpler to use.
Thanks, but it still doesn't work. It almost immediately connection refused.
Got it! Thanks a lot.
I didn't know this before, but clicking "start" and double-clicking the name do not have the same function as I thought (hey, I'm new to this).