How to configure NexusSfan FB:

Since Frozen Bubble doesn't have custom server options you have to run this command:
frozen-bubble --gameserver fb.nexussfan.cz
Or if you want to use TOR,
torsocks frozen-bubble --gameserver fb.nexus6brpdyn32zy4bdz53mle6tizdo2xwuszcqun2cmbmu6qnxysmad.onion

This will automatically load you into the server.