These related Help pages may answer your question:

• How do I recover my forgotten password?
  If you've forgotten your password, User ID, or both, we can send your User ID or steps to reset your password to the email address you registered with eBay. Click the link above for instructions to reset your password, recover your User ID, or change your password. . . .
• How do I create a secure eBay password?
  A secure password uses a combination of at least six letters, numbers, and special characters. For extra security, you can use multiple words without spaces, and capitalize different letters. It's also important to know that a real eBay employee will *never* ask you for your password. . . .
• Why can't I sign in and how do I fix this?
  You might be having problems signing in for a few different reasons. Click the link above to see a list of sign-in problems and their solutions. . . . .