Prefer the command line?
Make sure you have pip, the Python package manager installed. Needs to be Python 3, not Python 2. Lastly, make sure you have a Tor SOCKS proxy running locally (127.0.0.1:9050)
pip3 install doublemixer
doublemixer mix --currency bitcoin --output_address (your address)
DoubleMixer Python source code is also available on Github.