It is spot welded on.
The fenders, bumper, radiator, lights etc. all have to be removed.
There is a tool to "cut" out the spot welds, and Harbor Freight sells a spot welder.
Also, to do it correctly, that piece will need to be painted.
You could take it all apart yourself and find a body shop that will just remove and replace the radiator support and paint it. Then you could do the reassembly yourself. Of course, you'll have to tow the car to the body shop... and back.