Version 8 is not just a clone of version 7 with a fresh engine. It also brings its share of new features and novelty.
As far as the connection with Radiojar is concerned, the following image depicts which details of the broadcast link you will need to implement as to make a successful connection with Virtual DJ 8.
Protocol: Choose "IceCast"
Server URL (1): host
Mount Address (2): mount point*
Server Port (3): Port
Password(4): mount pass
*In case the connection fails, try using your radio station's mount point with the parameter: ?keep-input-open
You can find all these info at the settings->broadcast link of your radio station.