L2 disappeared the L2 under stat edit disappeared

Press STAT key. In the list of options that are displayed under the leftmost menu (EDIT) , press the 5:SetUpEditor. Press ENTER. It will restore the deleted list L1

You probably deleted it as a list variable. No matter, you can restore it (without its old content).

1. Press the [STAT] key.
2. Under the [EDIT] menu you see a list of options.
3. Press [5:SetUpEditor] then [ENTER]
4. All the default lists will be restored.

1. Press the [STAT] key.
2. Use arrow to move cursor to SetUpEditor
   
3. SetUpEditor command echoes on main claculator screen.
4. Press [ENTER]
5. Calculator will answer Done
6. Press [STAT] and select [1:Edit]
7. All the 6 lists will be available for editing.
   
8. Type in the values in your lists.

So you have deleted the L1,L2 lists. Well their contents are lost and the lists are no longer there to be filled. Right?
Have no fear, they can be restored (without your valuable data).

Press [STAT]. The Stat editor screen display 5 sub-menus.
Select [5:SetUpEditor] and press [ENTER].
Press [STAT][1:Edit] and you now see L1, and L2, and the lists you did not delete.
Enter your data again in L1 and L2.

There is no L7 list. You can put your data in any available list. You can even create your own lists.
Anyway, to recover the L1,L2,L3, and L4,
Press [STAT][5:SetUpEdidor] [ENTER]
Calculator displays Done.

Press [STAT]. Under Menu EDIT, Press [1:Edit]
The List editor opens the L1,L2, etc. liststo let you enter your data.

Hello,
Press [STAT][5:SetUpEditor][ENTER]
Press [STAT][1:Edit] and start entering your data, pressing [ENTER] after each data item. Press [ENTER] after the last item too.
Hope it helps.

enter your data into L1 as x-coordinates and L2 as y-coordinates at (STAT) + (EDIT) and then turn on your StatPlot. Finally, press (STAT) ->(CALC) -> (4)LinReg(ax+b) and (L1) (,) (L2) (Y1)
nb: Y1 could be find from (VARS) -> (Y-VARS)->(1:Function...)

Go into the STAT:EDIT function and Highlight L3. Push 2nd DEL (INSERT), and Put L2 back in. If there was data in List 2, it should reappear.

This is a pretty vague problem but not much of a problem. Your actualy plotting device of your stat plot is under your "y=". But before you do that you need to hit the stat button right next to the blue apps button. Then hit edit. These are your stat data. If you are trying to add data in you should notice what list they are under. (top of the screen L1, L2, ect.) You should also make sure that the number of data adds up for your two list. Now that you have done that you can go to "2nd" then hit "y=". If you don't want to graph your stat plots just make sure they all sat plot... off by hitting enter on the one that says that it is on. Now if you want one on hit enter and make sure your lists from your data match up with your stat plot. You can hit enter and see what one you need. they are above the 1, 2, 3, etc key. Hope this works. If all else fails you can clear your calculator by pressing "2nd", "+", "7", "1", "2". This will turn off all your stat plots if you have trouble understandsing this. But most importnat make sure your L1 and L2 match up on your stat plot with your list under your stat edit. If you don't understand this just i can help you out some more

Here goes if you still need this...

STAT, EDIT, put information into L1 if only one variable stats, but put info into L1 and L2 if it is frequency table stats.

Then choose Stat, over to CALC, 1, enter...if 1 variable stats then press enter again. If frequency table stats, then choose STAT, over to CALC, 1, 2nd, 1 [L!], 2nd, 2 [L2], enter.