Honestly, this is very straight forward; you download the client from the website and install it with few clicks. Here are some screenshots.
Once you are done with the installation, a new web page will pop, asking you to either fold as "Anonymous" or set up an identity. We want to help by folding as part the Microsoft team so let's set up an identity and join the Microsoft group (#999)
Once you hit the "Save" button, your machine will start the folding process.
Note: it can take up to few minutes for the process to start so no worries one you see the bar showing 0%, this is OK.Short enough, you will start seeing the CPU bar % going up.
Well, the short answer is that the FAH client is a CPU-intensive workload so yeah, don't expect for this thing to go easy on your system.
You can move the level of "Power" the client is using to fold as well as configuring it to fold only when you are away and the machine is idle.
In the screenshot below, you can how moving the Power level to "Full" hitting all the CPU cores on my machine.
No problem! just put http://localhost:7396/ or http://127.0.0.1:7396/ and you are good to go again.
Notice the warning saying "Quitting the browser will not stop folding. Folding happens in a background process on your computer through the program FAHClient even when Web Control is closed."
Nothing really. The more you are folding the more you are contributing so keep at it as long as you want - it is really up to you.
To stop processing, just click "Stop Folding".