Gross Profit Margin Interactive worksheet

Hi Guys
Just been looking for help with FNPF, and found the interactive spreadsheet for Gross Profit Margin.
It says you should be able to edit the spreadsheet to see the changes in the gross profit margin - but it wont let you do that - also on tab 3 of the spreadsheet they dont seem to have completed the sheet - or is it me that is missing something?
Any input much appreciated, as it is - this resource isnt very helpful to me at the moment.
Ta
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