MS Excel
You can edit a cell by

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

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MS Excel
How do you insert a row?

Select the row heading where you want to insert the new row and click the Insert Row button on the standard toolbar
All of the listed here
Select the row heading where you want to insert the new row and select Edit >Row from the menu
Right-click the row heading where you want to insert the new row and select Insert from the shortcut menu

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