Both the threads you mention are for the Windows version of Plesk.
Things may have changed but, for the Linux version, the last time I used this tool all it did was allow me to change the IP addresses associated with domains and nothing more I'm afraid.
I very much hope I'm wrong.
In any case, to use it you just need to run it
First find out where it is:
locate reconfigurator
Then run it (I'm assuming it is .sh but I may be wrong):
sh /path/to/reconfigurator.sh
It should tell you that it needs to make some files which you then need to edit (to change Ips).
After that, I don't honestly know. I'm sorry not to be able to be of any more help.
Faris.