MS Excel
You can edit a cell by

Selecting Edit > Edit cell from the menu
Clicking the formula button
None of these
Double clicking the cell to edit it in place

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MS Excel
How do you delete a column?

Select the column heading you want to delete and select the Delete Row button on the standard toolbar
Select the column heading you want to delete and select Insert Delete from the menu
Right click the column heading you want to delete and select delete from the shortcut menu
Select the row heading you want to delete and select Edit>Delete from the menu

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