you have to use an ftp program, i use flashFXP , there you only mark the directories you want to change, right click, and now you can click there on CHMODE and now you are able to mark different boxes, and at the bottom you could see the chmode figure, like 777 oder 755 oder 666 oder something else, only check the different boxes untill your wanted figure is standing there
sorry, VERY bad english, but i dont know how to explain better *G*