Newbie and question about Mt.Red difficullty

[mafamaul]

Hello,
I'm new here on the bitcoin community.
I have started mining on Mt.Red. My question is what do the difficulty settings mean.
My computer has a mining speed of about 15 Mhash/s. My difficulty is currently set to 1.
I can choose 0, 1 and N. Which one should I use to get the most bitcoins?

Thank you for your help 

[whitetoo]

I've also been researching this - perhaps I have this wrong but 15 Mhashs seems to be a waste of time and energy consumption - electricity charges will by far outweigh your earnings.

Check out this calculator:
http://www.alloscomp.com/bitcoin/calculator

Also mining hardware chart:
https://en.bitcoin.it/wiki/Mining_hardware_comparison

I tested on my home rig that generates 118Mhashs and thought this was poor.
With dedicated hardware mining rigs the difficulty is set to rise which will make home rigs pretty much worthless.

I'm a newbie as well to the mining concept so open to be corrected on any of the above.

[mafamaul]

Yeah I know it's not much but it's something. Besides, I'm not paying for electricity since I live in student halls