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Follow the below procedure to give the write permission.
 Access your control panel at https://www.yourdomain.com:8443 [ Example :https://www.crmcell.com:8443 ]
 Click on subscriptions
 Click on Open in Control Panel.
 Click on website and domains
 Click on File Manager
 Click on httpdocs
Note : You cannot change the permission for the folder httpdocs.
 Click on the lock icon in the right side of your file/folder/MSACCESS database.
 Click on Plesk IIS User in the left side under Group or user names.
 In the right side under Permission,you can give read and write permission.
 Click on ok.