Go to MY ACCOUNT SETTINGS.
Website FTP Details: This page allows you to change edit or update the FTP information in order to have the website published. This page cannot be edited by default, permission to edit or update the same should be granted by the application service provider. There you can check if the logins are correct or not, by clicking on Test FTP Setting.
If there are errors like FTP authentication failed that means your FTP logins are incorrect.
Your default FTP logins will be your cpanel logins.