There are many ways to get in touch with the team:
The team discusses activities on the kde-acessibility mailing list, learn about mailing lists.
The team also meets in #kde-accessibility on irc.freenode.net. Learn more about IRC.
Also, see a list of people currently working on the project.
The main activities of the project include assessing and documenting the accessibility features of KDE. This is described at The KDE Accessibility HOWTO.
Just open the help section of KDE. There are lots of opportunities to find and replace outdated screenshots or make sure that descriptions in the text are consistent with the interface in the software it is documenting. If you start with this, it should be simple to fix and commit your first contribution.
Getting started in a big project can be hard. Here are some people that are willing to help you on your way: