Click on the three-dot menu to the right-hand of a file or folder to bring up options for that file, such as renaming and deleting.
If a file/folder is locked (as shown by the padlock symbol) only admins for the board can rename or delete it. Non-admins can still open and download it.
Renaming a file or folder
To rename a file or folder in the documents section, open the menu and click on Rename. Type in the new name for the file/folder and click OK.
Deleting a file or folder
To delete a file or folder, open the menu and click on Delete.