Hi Muzaffer,
Thanks for posting your question. I'm sorry to hear you are having issues logging into cPanel. I'm more than happy to assist you today. We have a great tutorial to help walk you through the process of logging into cPanel. If you do not have your cPanel password, you'll need to reset it in AMP. Here's a few links that may help you out:
Logging into cPanelResetting your cPanel password in AMP
If you need further assistance please feel free to contact us.
Thanks!
Tim S