I just bought a house that has steam radiator heat and the boiler system says that it should be "flushed" weekly during the heating system. Do you know how to do this?

Yes it is called blowing down the boiler and you better get a pro to show you at least one time in person. Scalding can create a very serious burn and you do not want to go there. There is also a device that will automatically blowdown the boiler I you feel like having one installed.

At the same time the service person is there make sure they check for a Hartford loop in the system since it is also a safety device and trip check all other devices and controls.

When you call for service specifically demand a person with steam generation boiler experience. No one else will do.