Unlock Cells

1. Select the cells you want users to be able to modify.
2. Choose Home => Cells => Format => Format Cells, which displays the Format Cells dialog box.
3. Click the Protection tab and deselect the Locked option. Click ok.
   Optionally, choose Home => Cells => Format => Lock Cells. Because, by default, Excel locks all cells, choosing this option turns the Lock Cells option off. Click the option again to turn on the Lock Cells option.