Can't Do A Simple Trendline on Scatterplot

Hi,
I’m trying to create a linear trendline to fit a scatterplot of some data, but for some reason the “Insert Trend Line” option is greyed out. I followed all the instructions on this page, but it still won’t work. This seems like a pretty straightforward process, any ideas on where I went wrong?

Thanks!

Figured it out, you not only have to double click on the chart, but also click on the data points.

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Instead click on data points you can select series from the drop-down-list “Select Chart Element”. The “Insert Trendline” option is then in menu Insert or context menu. Get context menu by pressing Shift+F10 or pressing context menu key (between AltGr and Ctrl).