In normal window, there are four buttons. There are Home, Edit, Create and Share button.
Home Button: Go back to Home window
Edit Button: Edit files in current directory
Create Button: Create file or directory in current directory
Share Button: Share current directory via WiFi
By clicking the disclosure button on the right, we can view attributes of the file or directory.

In the attribute window, change name in the Name & Extension section.

There are special buttons for normal files. There are Open and Open As Button.
Open Button: Use Open button to view files
Open As Button: If the file extension is not a viewable file extension, the Open button could not be used. Use Open As button to view the file.

Click the Edit button

There are 4 buttons:
Copy Button: Copy files and directories to another directory
Move Button: Move files and directories to another directory
Link Button: Create a link for a file or directory
Delete Button: Delete files or directories

Choose files to manipulate

Click Copy button to copy the file

Choose a destination directory, then click Done button to finish the operation.
