Thank you for your message.
A lot of work could be done to improve WYMeditor, its documentation and overall communication.
As Jean-François said, there can be various ways to contribute: by coding, by testing and submitting bugs, by suggesting features, by helping users on the forum, by improving the documentation...
English is not our native language so there are surely a lot of things to improve on the website and on the wiki.
I discovered recently that some aspects of WYMeditor can be difficult to understand or get unnoticed for some people. So we discussed the possibility to make some screencasts to explain the usage and concepts of WYMeditor.
There may be other ways to help WYMeditor but I think all these points can be a good start.
Please let us know if you are interested to help in any of these areas.