Your user name can be between 4 and 20 characters long. It must start with a letter (a to z) and can be upper or lower case. All the other characters can be any combination of letters, digits or underscores ('_'). The case of a name does not make any difference, USER_NAME is the same name as user_name.
We use a hash function to encrypt your password when you enter it. We cannot work backwards from the password hash we store. If you forget it you will have to reset it.
A personal profile is for use by an individual. A listing profile is intended for use by organisations to promote their event or organisation. Each of the profile types have different posting priviledges. A personal profile can create event threads but there are limitations on how many.