TFS 1.X+ get a config value with c++ to dislpay on tibia client

[5lave Ots]

im using @Nekiro 's downgraded 8.6 tfs and i need to get a value X & Y from config.lua and insert them to a login error message
that is the c++ lines on (protocolLogin.cpp)

//acc name not exist
    Account account;
    if (!IOLoginData::loginserverAuthentication(accountName, password, account)) {
        disconnectClient("Wrong AccountName OR Password! ");
        return;
    }

its something like that disconnectClient("wrong acc or pass \n please goto (getConfig.LUA Value X) dot (getConfig.LUA Value Y) ");
so it will be like that after execution:

Wrong account number or password
Please Login at (config.serverName) . (config.DomainValue)

i saw a definition like that

    string[MOTD] = getGlobalString(L, "motd", "");

but i dont know how to redifine it and how to merge it on other files (if needed) dunno
Thanks