Let (x) be the real part and (y) be the imaginary part
Compute (r = sqrt{x^2 + y^2})
Compute (theta = tan^{-1}!left(frac{y}{x}right))
Adjust (theta) to the correct quadrant based on the signs of (x) and (y)
Write the polar form as (r(costheta + isintheta)) or (re^{itheta})