the most likely reasons for this are: you entered an incorrect username or password (check the email you were sent when you first registered) or the administrator has deleted your account for some reason. if it is the latter case then perhaps you did not post anything?

Write the above sentence using proper case.
The most likely reasons for this are: you entered an incorrect username or password (check the email you were sent when you first registered) or the administrator has deleted your account for some reason. If it is the latter case then perhaps you did not post anything?