It's very simple to use. You click on the first stage, and the first miner start work. He will work for 20 min.
After this period, you can claim Satoshi or, sometimes, you can choose between Satoshi or Equipment.
Equipment is convenient because allows you to mine in the others stage, that give you larger amount of Satoshi.
Equipment can be used for a restricted period of time - usually is enough for 2 claims.