Have an existing toilet with a broken flange .the flange is installed with lead to hold it in place. The house is on a concrete slab built in the 60's I tried a flange repair that screws on to existing old flange and don't seem to fit right .any way to replace the whole flange and pipe

That flange can be lifted with little bit of effort. However, there is always way of attaching repair collar over it. They sell several repair kits for situations like yours...

Any way you could take a photo of this flange and post it for us to see? It would be very helpful... Back to you... Milo