[Blunt P]

You need to save your message into a string, then you just have to format a new string.

PHP код:

new string[64], PlayerName[MAX_PLAYER_NAME];
GetPlayerName(playerid,PlayerName,sizeof(PlayerName));
format(string, sizeof(string),"Admin[%s]: %s",PlayerName,message);
SendMessageToAll(COLOR_ORANGE,string);