Look the user name in confirmation emails you recieved at the time of registration and you can retrieve password by using forgot password link in http://x10hosting.com/control .If you don't have emails then don't worry just post here moderators will help you.
Edit:- you can use email address you used at time of registration as user name too.
Login to account panel http://x10hosting.com/control .There you can Update your password for Cpanel.If old password is required , then use current forum password