Go to L2. The name should be highlighted. Then [2nd] "ins". 'Name' appears at the bottom. Type in the new name. [ENTER]. Then [2nd] L1. [Enter]
Go to [STAT] and choose "2: SortA( " or "3: SortD( ". Enter your list such as [2nd] "L1". [ENTER]. To view, go to [STAT] [ENTER].