Find the Opt-out Page
Convert Experiments offers an opt-out page where anybody can find out how to opt-out from any tracking activities we perform. This is located at http://www.convert.com/opt-out/.
Make your own Opt-out Page
Using our own page (as specified in the above link) as an example, you can create your own Opt-Out page on your site which lets visitors know that they can opt-out of running experiments.