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"How to I set write authority to this directory or other action to allow this file to be written?"

to modify permissions:

sudo chown -R $USER {directory/file}
sudo chmod -R u+rwx {directory/file}

chown changes owner to you the user and chmod adds read/write/and execute&search to you. Please replace {directory/file} with either a directory name (and the -R will recursively change everything within) or a file name. To learn more about these commands, type:

man chown

or

man chmod

in a terminal window and read the man pages.