There is currently only one option available under the TrendeX menu :
Add trend line to a x,y chart (two variable regression)
Adding Trend Lines to a x,y chart
The following dialog box will appear:
Lets talk about the functionality of the different parts of the dialog
Selecting the data to analyze and on which chart to plot the regression line
The order of the input data on the worksheet
The types of regression analysis that can be performed