radiator flush on 1996 Cadillac Seville STS

how do i flush my radiator on my 1996 cadillac STS?

The time to flush your radiator is .7 hrs in the book, probably better off having a shop flush your radiator because the cadillac cooling system can be complicated, but autozone, napa, kragen all sell radiator flush kits and antifreeze. The instructions are on the flush kit box.
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you have to remove the shield plate, then you will see the pitcock on the radiator
Then what do I do