Page Setup Option Not Available in Excel 365

Occasional Visitor

I'm using Office 365 online and am on an HP Chromebook (which I realize is not supported by MS Office).   In Excel, the option for adjusting margins is missing under Page Setup.   I went to File/Options/Change Regional Format Settings as directed here:   However, just as it appears in the example at this link, when English (United States) is selected, the "Change" section is grayed out.   


I need to be able to changes margins in Excel.  Why don't I have the ability to see this option?   I've spent a lot of time with MS Chat, and they were unable to help me.

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