Windows 10: Why can't I merge columns in my Excel spreadsheet?

I am modifying a spreadsheet developed by someone else. I have already unprotected the columns that I want to merge, but the "merge cells' choice is still not available to me. What am I doing wrong?

:)

 

Lost Data from an Excel Spreadsheet

While entering data about automobile records into a predesigned Excell spreadsheet, my sheet for May appeared with columns A, B and C missing along with the data I had entered. How do I recover these missing data?T

he sheet appeared with coulmn D on the left edge and the slider all the way to the left. The results of my entries were correctly displayed in columns to the right. When I inserted columns to the left, the hearing for columns B and C reappeared bur none
of the data. The Heading for the "Date" column (A) did not reappear nor an of the numbers in that column did not reappear.

 

Excel column width

Is there an easy way to change the column width on Excel using WP7? I copy files over from my PC where the data fits inside the column width but when I open on WP7 I see "xxxxxxxxx" in the column meaning the data won't fit. I've tried moving columns with
my fingernail after enlarging the spreadsheet but can't get it to do anything. Is the only approach to make the columns wider on the PC version first?

 

Simple spreadsheet will not allow editing

I just bought an HTC Win 8 phone mainly for the built in Office suite. I emailed an Excel spreadsheet to the phone and like many others it will not allow editing. This spreadsheet has no formulas, it is a 3 column list of books, authors and dates.
Has anyone found a workaround?