1.I guess:
Code:
register_concmd("amx_register", "register_user", ADMIN_ALL, "<mod:1[Name],2[Ip],3[SteamID]> <password>");
register_concmd("amx_login", "login_user", ADMIN_ALL, "<password>");
register_concmd("amx_changepassword", "change_password", ADMIN_ALL, "<old password> <new password>");
TO
Code:
register_clcmd("/register", "register_user", ADMIN_ALL, "<mod:1[Name],2[Ip],3[SteamID]> <password>");
register_clcmd("/login", "login_user", ADMIN_ALL, "<password>");
register_clcmd("/cpass", "change_password", ADMIN_ALL, "<old password> <new password>");
But i'm not really sure about that ;D