From the Folders view when you select a folder from the tree, on condition you have the necessary permissions, the "New folder" button will appear on the button bar.
To create a new folder you need to select the parent folder and then click "New folder".
The "New folder" button only appears in the folders for which the user has permissions to manage their structure.
The "New folder" button opens a window where you can enter the name of the folder to be created.
Clicking OK will create the new folder.
It is also possible to create folders through the folder options menu, by clicking the right button on the folder tree where you want to create the new folder.
Another way of creating folders is using the folder manager.
From the Folders view, click the cog icon in the bottom left hand corner of the folder tree and this will open the folder manager.
From the manager window select the folder and then click "New folder". A text box will pop up for you to enter the name of your new folder.