Sure, you need to update the form authentication to 'basic authentication' by yourself then.
You can look at the web.xml file here. https://github.com/bpmc/bpm-console/blob/master/server/war/src/main/webapp/WEB-INF/web.xml
But unfortunately I couldn't find this web.xml, I don't have the code, I just used jbpm-5.0.0-installer-full.zip and followed its instructions.
I checked almost every possible location in installation folder, but couldn't find. Can you help me to locate it in an installed jBPM.
I haven't installed the jbpm 5.0.0, but I believe you can find the jbpm-gwt-console-server-5.0.0.war in the deploy folder.
You'll have to unzip the war to see the web.xml in the WEB-INF/ folder.