To allow data to be entered in this:
1. Select the cells where entering or changing data will be allowed.
2. Click the Home Tab, click Format in the Cells group, and select Format Cells to open the Format Cells dialog box.
3. Select the Protection tab, clear the Locked check box, click OK.
4. Click the Home tab, click Format in the Cells group, and click Protect Sheet.
5. Select a password if desired and clear the Select locked cells check box.