You can usually do this by double-clicking the file's name on your computer. Each sheet's tab appears along the bottom of Excel. The protected sheet often has a padlock icon in some versions of Excel. Right-click the tab (or the lock icon) to open the context menu. If multiple sheets are protected, you'll need to remove protection on each sheet separately. If the sheet is not password-protected, it will unlock immediately. If not, you'll be prompted to enter a password into a pop-up window. If the password is correct, the sheet will become unprotected.  If you don't know the password, see the Using Google Sheets method. This method lets you upload the file to Google Sheets, which removes all protections added in Excel. If you're using Excel 2010 or earlier and prefer not to upload to Google Sheets, see the Using VBA Code in Excel 2010 and Earlier method.

How would you rephrase that briefly using Vietnamese?
Mở workbook có trang tính được bảo vệ trên Microsoft Excel. Nhấp phải vào thẻ của trang tính được bảo vệ. Nhấp vào Unprotect Sheet (Gỡ bảo vệ trang tính). Nhập mật khẩu và nhấp OK.