My friend doesn’t like his old name on Vassal, and he wants to change it. But there isn’t such option even after he deleted Vassal and re-download it. Is there a way to do that?
I’m not a mod here, but getting a new account is as easy as logging out and then creating a new account. As with almost all websites, I doubt that changing the name on an existing account is possible.
I’m understanding this question to refer to one’s username associated with a module–not sure if that’s correct. If so, simply open the module in question, go to File → Preferences, and change the username on the Personal tab.
Usernames and passwords are configured on a per-module basis, they aren’t globally applicable to VASSAL.