There is an "Upload" button in the lower left of the iPhone version of MS for this discussion board. I presume there is one there for Android versions. You should be able to access images or even upload an MS file. Without knowing the form of the equations, it is hard to show you how.
I happen to have the orbital elements from JPL myself, http://ssd.jpl.nasa.gov/?planet_pos and plot planetary positions using that simplified form. I also use their ephemerides tables via their Horizons website http://ssd.jpl.nasa.gov/horizons.cgi
But to give you just a flavor, we know the form of an orbit is an ellipse, so we can write:
r(a,e,@theta) = a*(1-e^2)/(1+e*cos(@theta))
where a = semi major axis, e = eccentricity and theta = 0-> 2pi. MS can plot that in polar nicely as:
But we can also covert that to a parametric form, since we know that x = r*cos(theta) and y = r*sin(theta). Plotting that we have:
Hope this helps.