Is there any more technical information, installation steps for server, client and mobile, setup documentation for system parameters for MyWMS?
Yes, there is technical documentation about this software. I have checked the official website and there is a page with all these instructions. You can access it below.
Documentation: http://community.mywms.org/en/community/documentation/users-guide/
Unfortunately, this is the only thing available as technical documentation. To obtain more, install the application and check the installation directory. There should be PDF instructions as well.