You ,ight describe the rad to everyone and which kind of system it is in so you can get some advice.
A steam radiator just needs to be removed by loosening or breaking fittiings and plugging or capping the pipe so steam doesn’t come out. A water rad has to have the system drained below the rad so you can do the same. Then tte system has to be refilled and air purged as at: http://126.96.36.199/hydronic/service/purgeair.htm
Full descriptions always help more than single sentences using jargon.