Remove and edit folder permissions of the site created with Aruba Nuke

In order to remove and edit the folder permissions you need, when logged in as an administrator, to click File Manager in the menu and select the Security settings section:

In the View Folder column, check  the check box beside each role to be granted permission to view files.
In the Write to Folder column, check  the check box beside each role to be granted permission to upload files.
Click Update.