If you didn't add anything into Settings>Advanced>Exluded shell context menu items then it should show.
The other reason why some context menu item is not showing is if you are running OC as administrator, or if shell extension is 32bit.
You may need to close OC completely (from system tray) after changing
Winrar>Settings>Integration>Context menu items, but I am not sure as Windows is controlling what shell items programs have access to