i bought a pen asic how can i mine eth . can you please explain to me thans for help me
Not at all. ASICs are either to mine coins with SHA256 algo (like BTC) or Scrypt algo (like LTC).
ETH is a coin that can be mined by CPU and GPU.
You better ask such questions in the mining section to get more help
https://bitcointalk.org/index.php?board=160.0