Click the OK button.
Doing this closes the General Options dialog box and opens a Confirm Password dialog box, where you need to exactly reproduce the password. If you just entered a password in the Password to Open text box, you need to reenter this password in the Confirm Password dialog box.
If you just entered a password in the Password to Modify text box, you need only to reproduce this password in the Confirm Password dialog box. However, if you entered a password in both the Password to Open text box and the Password to Modify text box, you must reproduce both passwords.
In the first Confirm Password dialog box, enter the password you entered in the Password to Open text box. Immediately after you click OK in the first Confirm Password dialog box, the second Confirm Password dialog box appears, where you reproduce the password you entered in the Password to Modify text box.
Type the password exactly as you entered it in the Password to Open text box (or Password to Modify text box, if you didn’t use the Password to Open text box) and then click OK.
If your password does not match exactly (in both characters and case) the one you originally entered, Excel displays an alert dialog box, indicating that the confirmation password is not identical. When you click OK in this alert dialog box, Excel returns you to the original General Options dialog box, where you can do one of two things:
Reenter the password in the original text box. Click the OK button to redisplay the Confirm Password dialog box, where you can try again to reproduce the original. (Make sure that you’ve not engaged the Caps Lock key by accident.)
If you assigned both a password to open the workbook and one to modify it, Excel displays a second Confirm Password dialog box as soon as you click OK in the first one and successfully reproduce the password to open the file. You then repeat Step 5, this time exactly reproducing the password to modify the workbook before you click OK.
When you finish confirming the original password(s), you are ready to save the workbook in the Save As dialog box.