Es hat Funktioniert!
//==============================================================================
//Spawn as Serverowner!
//==============================================================================
if(AccInfo[playerid][Level] >= 10)//umändern in deine abfrage
{
new string[128];
format(string,sizeof(string),"Serverowner %s joined the Server",SName[playerid]);
SendClientMessage(playerid,LIGHTBLUE3,string);
}