FileOp Failure in Cpanel

Been setting up a site using wordpress over the last few day.
Just installed the DB-Manager plugin and got this message under the dashboard:

Your backup folder MIGHT be visible to the public

To correct this issue, move the .htaccess file from wp-content/plugins/wp-dbmanager to /home/wellness/public_html/blog/wp-content/backup-db

I tried to do just this, but cpanel wouldnt allow me to move the said file. It gave me a

FileOp Failure on: /home/wellness/public_html/wp-content/plugins/wp-dbmanager/htaccess.txt: Permission denied

This same error message comes up when I try to change file permissions, or try to move any other plugin files.

I’m sure theres a simple solution, but Ive been searching and can’t seem to find it!