Hikashop Register Username digits

-- HikaShop version -- : 2.5
-- Joomla version -- : 3.5.1
-- PHP version -- : 5.4
-- Browser(s) name and version -- : Chrome 42
-- Error-message(debug-mod must be tuned on) -- : Hikashop Username needs to be two digits.

Dear all,

I found that Hikashop Register Username can't be put in only one letter or one Chinese character, but I use it as the first name. Some people has only one Chinese character for the first name. That causes the registration can't be done. Is there any way to change the rule/regulation? Thanks a lot.

Hi,

There is no such rule in HikaShop. This comes from Joomla.
You would have to change the line: in the file libraries/joomla/table/user.php

Thank you a lot, I thought I have asked you again, but it seems didn't work. I then ask again. I found that the same username would be blocked too. How can I edit this code to be good for one character and same username? Appreciate your answer.

What do you mean by "same username" ?
The username has to be unique. Each user account is identified by its username in Joomla. It has to be unique and that can't be otherwise.
It's not something that is controlled by HikaShop, but even in Joomla, there is no easy way to change that uniqueness if that's what you're talking about.