Need help filling in a part to make it solid

[Roxy]

very confused. i downloaded the program. not sure what to do next?

Install it so it can run on your machine????

how do i import the stl and then what do i do past the code above into the editor?
thanks for the direction

The source code was given so you could learn. The very first line of the do_fill() module is:

module do_fill() {
    translate([-7,-14,0]) import("fibofidget.stl");

That is how original image gets pulled into OpenScad to be modified.

To proceed, you would make a source file called do_fill.scad in some directory. Put that code into the file do_fill.scad. Put the original .STL file (with the correct name of fibofidget.stl) in the same directory. Double click on the do_fill.scad file from within Windows Explorer. That will bring up OpenScad. You should see an initial rendering of the output at that point.