There are many ways to participate and we're always looking for contributors. Just on the ODF Toolkit Project and afterwards watch this project. Then you may want to start with reading and posting on the mailing lists or report bugs or write documentation.
If you're a developer, just dive into the development section. Here you find information on where to access the source code and how to set up a build environment.
General information on doing the first pull-request can be found on this blog.
For any questions, comments, or concerns about this project or website please contact the project on the developer mail list.
Please create issue on our GitHub.
Take a look at 'finding an ODF feature in ODFDOM'.