If you've forgotten your account details, you should be able to use the Yahoo Sign-In Helper to reset and/or recover that information.
You'll need to supply some information that ties you to the account, such as:
The helper is available here: https://login.yahoo.com/forgot?
Note: The Yahoo account email address you gave above includes a space in it. Valid email addresses do not include a space, so be careful of that when trying to use it.
If you have further questions on this issue, please let me know.