in ftp,
to set permissions right click on the desired file or folder and the option should appear for you. it is also called CHMOD.
upload the php file as you did the folders. through ftp. click and drag or highlight and transfer. depends on which ftp program you are using. or you can use the file manager in your bravenet account area.
you said this...
"Set up folders and uploaded folders in Ftp"
so i assumed you have an ftp program installed and have used it already.
you use your ftp program to do the things i mentioned. in the ftp program, there is one window for your computer and one window showing your online area.