This Joofa Tutorial video may help and there is a link there also for the Joofa plugin
Remember to get the original color back set your FFT layer to luminosity - or - add a new layer with the Original and set the blend mode to color .
Sorry about this.... the site, plugin, or support are no longer available. They seem to be dead in the water because not enough people supported them with payments.
Joofa-Info, " Current Status
After providing free plugin support for several years, unfortunately, we had to discontinue the support. Development, support, and hosting these plugins incur cost. If there is sufficient interest in the plugins then they may be available again. "