how to mine it with cpu??? 
I need some help, and I hope someone can tell me. thanks so much,
I need some help, and I hope someone can tell me. thanks so much,You can't mine it with CPU. Mining with GPU is the only method and that generates little income.
Beg to differ, you can and I do.
But I will agree its not worth having your PC running just for mining with your CPU, electricity will cost way more than you will make, but you can have it running in the background whilst you are surfing the web for a few exta kHashes, or if you use your PC for GPU mining, might as well use the CPU as well, just need to leave one core available or it will slow down GPU mining.
I don't even think it's worth paying for the extra power to run through the CPU for some of us. Just depends On cost of power for hashrate return.
Also keep in mind you already have all the power for GPUs running through the motherboard... you don't want to risk frying it by powering the CPU also. Just something to keep in mind. Obviously if it's working for you, great, but for me personally, it's not worth the risk for a few extra kh/s.