Does anyone know how to calculate the fixed stars in the birthchart?

Fixed stars at at "fixed" points, so they don't change positions. You can find a list of fixed stars and their astrological positions and see if there are any points in your chart at that position (1-2 degree orb for fixed stars, though some are less).

http://www.astrologycom.com/fixedstars.html

...........Lovely. The very first fixed star mentions extreme misfortune until April 2011, which is when something really horrible happened to me. I don't know when it left, but the misfortune happened at the end of April when I dumped the only man I ever loved for abusing my trust. The degree in question for me is 0 degrees, eight minutes. It doesn't appear to be a fixed star that affects me, but maybe I'm wrong since something did happen to me in the span it mentioned there.

On the other hand, I love looking up fixed stars. They're just interesting to me.

One of the most interesting reports is the one
with Solar Fires install

How much does it cost to get that Solar Fires program? I apologize if it costs nothing, but if it's decent or better it usually costs money.