You can configure FR24 as described in the thread over at FR24 or here Bake a Pi
The installation of dump1090-fa and piaware you can just do as described on the install page you linked.
You will need to either deactivate or remove dump1090-mutability.
sudo apt-get remove dump1090-mutability
You might also need to run:
sudo lighty-disable-mod dump1090
Those two only apply if you had dump1090-mutability installed before.
If FR24 is already installed and configured to get data on port 30005 there is no need to change anything.