You can change the port your Unimus server runs on.
You can also change the server bind-address if neccessary.

On Windows:

For portable:
Create a file named Unimus.l4j.ini in the same directory as the Unimus executable.
Change Unimus in the above file name to exactly match the name of the Unimus executable.

For installer:
Add the below lines to Unimus.l4j.ini in 'C:\Program Files\Unimus\'.

Inside of this configuration file, please add the following lines:

-Dserver.address=<your_ip>
-Dserver.port=<port>

Please make sure to place each argument into its own line.
Insert proper values behind each configuration argument.

If you only want to configure a single parameter, please omit the other.

Restart Unimus, and the configuration should be applied.

On Linux (Debian/Ubuntu):

Edit the contents of /etc/default/unimus.

Add this into the file:

-Dserver.address=<your_ip> -Dserver.port=<port>

Insert proper values behind each configuration argument.

If you only want to configure a single parameter, please omit the other.

Restart Unimus, and the configuration should be applied.

Running in Tomcat:

Please refer to Tomcat documentation on configuring server port and bind-address.

How this is configured depends on the distribution and packaging of your Tomcat.