We support WordPress through two different options. The first you can find here, and uses the binary memcache protocol and is supported by us. It should be easy to install, simply follow the instructions on the Git repo.
We also have a community support alternative approach that uses the ASCII memcache protocol, which is far easier to get running on your own servers if you aren't using a hosted platform like Heroku. You can find it on GitHub here. Please follow the instructions on the repo page.