A very popular, comprehensive tutorial titled "Processing a (noisy) DSLR image stack with StarTools" by Astro Blog Delta.
Thank you StarTools for turning my average photos into amazing ones.
'Grain Limit Detail' and 'Grain Limit Color' set the largest visible noise grain size, for detail (luminance) and color respectively, that Denoise 2 should target.
The Filter module allows for the modification of features in the image by their colour by simply clicking on them.
You can convert everything you see to a format you find convenient. Give it a try!