List Box problem

Dear Expert,

First time to try Listbox. Please bear with me if it is stupid question.

Search the Web and would like to get some information.
Found this and donwload the file.

http://www.contextures.com/xlDataVal10.html
(Very much appreciated)

Slightly modified that so that it could fit my need.

However, no matter how hard I tried .... I cannot go into the properties to change the data row.
Now datarow can be up to 12 only. I would like to get the data up to 66.

I followed its instruction and everytime I clicked the properties button.
It showed Sheet properties rather than Listbox properties.

I would like to add "Date" listbox to get data from Column N.
As said, cannot go into properties and it is hard to make it too.

Hope expert can advise and help.

Thanks indeed.
Elton