Is it possible to change file status (from read only to read and write) for multiple files/folders at once?
Open terminal and try the following; putting the path of your new directory behind the /:

chmod -R o+rw /path/to/your/new/directory


-R means recursively change the permissions of all files in the directory, with the arguments ( o+rw ):

o ( the other users), alternatively u (for user) or g (for group)
r ( read )
w ( write )