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 to use SoundCloud’s search function to find your account on your computer or mobile browser or by simply going here.
You will be able then to sign up on your computer using your profile URL and your password. Please remember to just type in the last part of your URL (e.g alex).
If this did not solve the issue you’re facing, these other articles might help: