We can understand that sometimes we can all forget things. Your username is an email that you use to register for the Yellow Images account. So, think about the email that you use most often, maybe it is your email login after all?
If you still can't remember your login, please contact our Support Team. Don't be surprised when our team asks several security questions in order to confirm your (secret) identity!
If you just need to change your password, please check out the article How to change my password.