When I lived in Japan and Korea, I used to use it a lot. But the account I made was on another computer and I believe I wasn't the one who made the account initially.

http://i.pps.tv/kh_register.php

When I register, I get three different error codes, but they shows as "S*#$JKKLE" instead of some kind of Chinese message, so I don't know what I'm entering in wrong.

If I'm reading this right, password must be 4~16 characters, with numbers, letters, and ?-,@.
I've tried using both gmail, yahoo, and outlook (@outlook.com address), just in case PPStream didn't like Gmail.
My password is 12 characters long (the one I'm trying).

Am I doing anything wrong for registration? Or is it because I'm in the states. If someone could chime in, it would be greatly appreciated.

Uername:
仅可使用字母,汉字,数字,下划线,小数点,连接符
Only letters, hanzi, numbers, underscores, periods, and something about 连接符.

Password:
只能包含6-16位大小写英文、数字、.-_?
6-16 upper- and lowercase letters, numbers, periods, dashes, underscores, or question marks. Looking at its validation code, it will give you a stronger password for each of: 1) a number, 2) a letter, and 3) a punctuation character. I don't know if it won't let you create a too-weak password, but it doesn't care about password length, so if you don't have one of those three types of character, you might try a password that does have one.

Did you try in different browsers? Maybe something about the current browser is mangling the error message.