If you can’t sign in to your account because you don’t know the email address nor the profile URL (e.g. alex or http://soundcloud.com/alex), try some of the following:
- Use SoundCloud’s search function to find your account
- Search for any emails that you’ve received from SoundCloud in the past, and look at the email address that they were sent to.
- Sign in with either Google+ or Facebook.
If you have found the email address of profile URL associated with your account, you can use that to sign in.
If this did not solve the issue you’re facing, these other articles might help: