cannot delete macro, Unhide is greyed out

[Excel20000]

novice user with the most novice question.

I have a workbook "August 2016.xlsm" which has several macros (created by others). One macro is "PERSONAL.XLSB!test1" which I want to delete.
I know that to delete, I must Unhide the Personal Workbook. But right click on a worksheet and Unhide is greyed out.
I have been googling for some time but all answers are for some other issue, not this one.

thanks.

[alansidman]

From the MS website:

Delete a macro

Do one of the following:

Open the workbook that contains the macro that you want to delete.

If the macro that you want to delete is stored in the personal macro workbook (Personal.xlsb), and this workbook is hidden, do the following to unhide the workbook:

On the View tab, in the Window group, click Unhide.

Under Unhide workbooks, click PERSONAL, and then click OK.

In the Macros in list, select the workbook that contains the macro that you want to delete. For example, click This Workbook.

In the Macro name box, click the name of the macro that you want to delete.

Click Delete.