Quote Originally Posted by Hannibal99
do i remove the whole senate faction and give rome to julii?
Yes, that's what the tutorial tells you to do:

Cut the settlement description block from the Senate's faction description and paste it into the Julii faction description with the other Julii settlements. If you make it the first Julii settlement listed, Rome will become the new Julii capital.

Then remove all of the remaining Senate faction information.