i am using a mac book pro with OSX.. lost up to do date software for all

these are the direction i am using but i dont see a left pane
To add files/folders to your Media Library:
1. Select "Media Library" in the left pane of the main window.
2. Right-click the Media Library area, and click Add Folder (or Add File)
3. Select the file/folder you wish to add, then click OK.