Newbie query about adding trendline

[pb1]

The manual says: "Excel makes adding a trend line to a chart quite simple.
Select Chart => Add

Trendline to display the Add Trendline dialog box."

But I can't find the correct entry point. What I discovered from Excel
Standard Toolbar: Insert => Chart => Chart Wizard - Step 1 of 4. Even
though I went through all the 4 steps I couldn't find the [Add Trendline]
button. Certainly somebody out here can help me to solve such simple
problem. Thanks!

 

[pb1]

Oopse, I got it a few minutes after posting.
A new [Chart] button will appear when I click a chart already set up by
Chart wizard. Anyway thank for your attention.