MS Excel
To center worksheet titles across a range of cells, you must

Format the cells with the comma style
Widen the columns
Select the cells containing the title text plus the range over which the title text is to be centered
Select the cells containing the title text plus the range over which the title text is to be enfettered

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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
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
All of the listed here

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