Open Excel form, select the area you want to encrypt, then select "Review--Allow user Edit area" in menu bar;
Second, Excel will pop up a window, click on the right side of the "new";
Third, in the jump to the "New Zone" dialog box, under "Zone password" Enter the password, click the OK button;
After that, confirm the input password again, click OK;
Five, then return to the Conversation box, click on the bottom of the "Protect Workbook" button to activate a password-protected area;
Six, this time will pop up a "Protect sheet" dialog box, in the Red box to enter a protection password and click to confirm;
After seven, confirm this password again;
Eight, then return to Excel, you will find that if you want to modify the encrypted area, you need to enter a password to be able to modify.