EZ-Scan's database files will likely be updated over the weekend.
To edit the info manually...
Go to the Trunked Radio Systems tab at the bottom of EZ Scan... on that tab, click the trunked radio system at the top that you want to change. Below the list of systems on the left side, is the site list (one site should be in the list). Click that site, then to the right should be the frequencies. You only NEED to put in the control channel and alternates, but some people like to put all of the frequencies in just in case.
As for the live feeds, one of the Loudoun Sheriff feeds just recently appeared, with Leesburg also. It definitely sounds good, but I can't compare it to the other one that doesn't have Leesburg, since it's been down when I've been on the site.