go to the directory on ftp you want to make chmod in (not with!) then click on each file to be chmodded and then write: chmod 777 filename
(filename = file.extension) Directories are treated as files (can be chmodded as well), but if you want to chmod all files in a directory, you must go to the directory and manually chmod each file individually. I think that if a directory was chmodded to 777, all new files that will be later created in it by a script (quickcart) will be already chmoded, so don't worry about that. Only existing files need to be chmodded.
Chmodded permissions can be seen for all files in the directory if you go inside to the directory, right-click on any file and select properties (providing your mouse is not idiotically set up to selecting files with RMB in TotalCmd). If the dir is empty, go inside and right click on two dots [..], then select properties.
Next time please try asking in english, more people will be able to help you.
