[RajatPawar]

pawn Код:

public OnDialogReponse(...)
{
   if( dialogid == DIALOG_PASSWORD )
   {
        if( !response ) 
        {
               SendClientMessage(.. "Sorry." );
               Kick(playerid);
        }
        YOUR CODE
    }

This is the way to kick on clicking the 2nd button on the dialog. Similarly, where you actually login the player - something like this should work.

pawn Код:

if( strcmp(inputtext, players_actual_password) == 0) // it is correct
{
      LOG HIM IN
}
else return Kick(playerid);