If your talking about hash rate you need to look at your dash board. Then under Actions there is a icon of a monitor, click on the monitor.
How can you see how much you've mined?
I'm not talking about the hashrate. I'm asking about the total amount that has been mined. On ethermine.org you enter your eth address and you can see your unpaid balance, hash rate, active workers, and shares. I don't see anything like that on simplemining.net
Simplemining (or any mining OS) is not a substitute for a pool or pool stats.