Mi espanol es muy mal, that's why Ill answer in english.
When you say your PCs IP has changed, do you mean that of the server? On boot of the server it tells you under which IP you can open the webinterface or you can check by running ip a
and then just typing that IP at port 8006 into your browser, e.g 192.168.0.42:8006
or whatever it tells you. You can also change the IP of the server with nano /etc/network/interfaces