My ip to connect cockpit interface didn't work

Hi ,
i use cockpit for create a windows VM ,
i’m pretty bad at use putty , so i follow a nice tuto ,
all is good , i install cockpit , and cockpit machines , but when i wrote : hostname-I the ip to connect won’t work i d’ont know why , i put the :9090 as port BTW
So if somone can help me
Thanks