Not Able To Create New Mail

I have installed your free version with the license you provide, but I am having a problem. I think it might be because of the way I installed the program. When I initially installed the email program it asked for a directory to store the email in, and I think I might have made the wrong choice.
The problem I am having is when I try to create new mail the program does not open the new mail interface. Could the problem be caused by the way I installed the software?

strange. Did you get some error during your use of our program?
A directory to store your mails in can be changed by menu Tools-Settings-Storage. But be aware of note below the text-box for path changing.
Hope this will help.