As long as you remember your email, you can easily reset your password. Head to the sign in page and enter your username. Once this has been entered, click “Forgot your password?”. This will reset your password and a new password will be sent to your email address. Once the email has been located, proceed to signing in with your email address and the new password. And make sure to write down that new password!
Want to change the password? See How do I change my password? Link to question