In File Manager, select the icon of the file or folder for which you want to change an ACL entry.
Choose Properties from the File Manager Selected menu or from the icon's pop-up menu (displayed by pressing Shift+F10 or mouse button 3).
The Permissions dialog box appears.
Select the entry in the Access Control List Permissions scrolling list that you want to change.
The Change Access List Entry dialog box appears.
Click the Permission check boxes to reflect the values you want for the ACL entry.
The status line at the bottom of the dialog box informs you if the permissions you request are restricted by the mask.
Click the Change button in the Change Access List Entry dialog box.
Use the Apply Changes To option button to choose the scope of the change.
For files, the options are This File Only (default), All Files in Parent Folder, and All Files in Parent Folder and its Subfolders. For folders, the options are This folder only (default) and This folder and its Subfolders.
Click OK to apply the current settings and dismiss the dialog box. Click Apply to apply the settings without dismissing the dialog box.