If you do not mind the hassle of subscribing, the jomic-users mailing list is the preferred place to ask questions, report bugs, suggest features, or discuss other issues related to Jomic.
As Jomic is hosted on Sourceforge, so you can also use the following facilities to:
download updates
post a question to the help forum
report and track bugs
look what new features are already planned
access the source code
If you want to play with the code or contribute, read the notes on development. This explains how to setup an environment in which you can compile and run Jomic.
To contact me directly, use my SourceForge user page.