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how to know the directory location of a folder eg C: / myjournal / files
By OJS i'm assuming you mean Open Journal System. If you have installed this onto a domain it will always be /example.com/htdocs/ make sure that where ive put example.com put your domain. You should be able to access this through FTP of the built in file manager if you haven't already. If you need the complete root login to the cpanel of the account you have installed it on and at the bottom of the right sidebar tab named "Account Details" you will find the Home Directory! (example: /home/vol4_1/freecluster.eu/fceu_12345678 )