No problem, go to Login page and click on "Forget your password"
You will be redirected to another page, enter your email address which was used at the time of registration and click "Retrieve Password"
if you will enter the correct email address then you would see the following message
If you will enter the wrong email address, then you will see the following error message. Make sure to enter the right email address this time and click on "Retrieve Password" again.