How to Steal an Online Password

how to steal an online password for an account in www.experienceproject.com. No, cant use kali or any linux based soft as i am using myself windows7. I am a newbie. Not familiar yet with a lot of soft or coding. want to work on windows first to check up my own capabilities or how much can i do. It would be helpful if anyone can give any suggestion or learning step-by-step procedure. Thank you.