[Abreezy]

pawn Код:

new pLogged[MAX_PLAYERS];

On successful login do:

pawn Код:

pLogged[playerid] = 1;

Then do this:

pawn Код:

public OnPlayerText(playerid, text[])
{
    new string[128], name[MAX_PLAYER_NAME];
    GetPlayerName(playerid, name, MAX_PLAYER_NAME);
    if(pLogged == 1)
    {
        format(string, sizeof(string), "%s says %s", name, text);
        SendClientMessageToAll(-1, string);
    }
    else
    {
             SendClientMessage(playerid, -1, "You must be logged in to talk!");
    }
    return 0;
}