Fit straight lines to multiple plotted charts and display equation

[#1]

I need to do a linear fit on my data plotted as multiple graphs similar to shown in the attached example. I am still learning JMP so do not know how to do linear fit on each plotted graph and display the equation on it. Any help is appreciated. 

[#2]

Select Graph > Graph Builder.

Drag data column with response to the Y drop zone.

Drag data column with factor to the X drop zone.

Drag data column with Subsite to Group X drop zone.

Shift-click the regression element along the top.

[#3]

@Mark_Bailey . Thanks, but I did not get the "Shift-click the regression element along the top". Where to find this option?

[#4 · Accepted solution]

There should be a set of "icons" across the top (see red arrow).  If you select the 3rd icon, that puts a best fit line through the data.  Then it opens up options.  Check the box next to equation (other red arrow)