Then download the BOINC software and start running it. WCG is CPU only. It also has a lot of cancer related projects. Smash Childhood Cancer and Mapping Cancer Markers are the two current cancer related projects running.
If you're not dead set on F@H, [H] participates in BOINC projects that benefit from GPUs as well. One such project is called GPUGrid and can be located here: https://www.gpugrid.net/ I don't have a cool signup link for this project that automatically assigns you to our team so once you register you'll have to click join on the team page which is located here: https://www.gpugrid.net/team_display.php?teamid=799
Both GPUGrid and WCG run under the same program called the BOINC Manager. I can walk you through the setup on both of them if you need.
It's been a while since I ran F@H, but I believe their v7 client is still the latest client. Just install it and let her run. Disable the CPU if you wish to utilize those CPUs somewhere else.
Also, no matter where you run those CPUs make sure you leave a core dedicated to the GPUs. They need some CPU processing to do their GPU computing.