Here is the Advanced view. I don't think I have changed anything but I am trying to get it to use a different port. However, when I change the network type to Custom br:0, and I click on WebUii, a Guac login page opens and I can login. When I first did this, the page didn't come up right away...gave me an error page but then a few seconds later the login page came up. This seems to be the only way to get this to work for me.