If you have any questions or problems you might find help in the online documentation or in the FAQ

For bugs, questions, suggestions and feature requestsyou can use the online Issue form for private help.
And if you want faster response use the online support forum first.
You can also use the "Send Feedback" option from inside MultiCommander. It is found under the 'Help' Menu

If you need to send a private message to the author if any other reason then you use the contact form