I chose cgminer.

I'm a bit confused with the settings... 

What is Append JSON conf (-c /var/www/minera/conf/miner_conf.json)?
How should I set the other on/off buttons? (Script, auto login, auto-debug...)

My miner seems to be recognized, but I can't get a hash rate


And what exactly are error/rejected rates? 


Thanks a lot for your answers!