To remove protection from the spreadsheet, open it in Excel, click the "Review" tab and then click "Unprotect Sheet" in the Changes group. Type the password into the Password field and click "OK." ...

For a workbook composed of multiple spreadsheets, select Protect Workbook followed by Unprotect Workbook. Enter the Workbook password again when prompted and select OK to remove protections.

Safeguard your Excel worksheets from accidentally deleting formulas or data sets by locking important cells, while leaving the rest of the worksheet editable.