You can unprotect an Excel workbook by following these steps:
Open the workbook and select the “Review” tab.
From the “Protect” section, choose “Unprotect Sheet.”
If you didn’t use a password to protect your worksheet, your worksheet is now unlocked.
In case you did use a password, then in the “Unprotect Sheet” box, enter your password and click “OK.”
I hope this helps!