Currently the organisation is unstructured and there is no formal membership process. Regardless, you should get involved:
We have a Facebook Group where much of the discussion takes place (We would rather move away from Facebook but right now we’re fledgeling and that’s where people are).
If you would rather not join a Facebook group then please email James and he will keep you updated (yes, this is a massively manual effort. Yes, it will encourage us to arrange something more robust quickly)