Navi Dvd

How do you remove a factory stereo from an 07 grand prix?

We have a eclipse fold out dvd player and navi. We just had it taken out of previous car and installed in our new car. So its in but we forgot to take one of the harnesses so the stereo place just said take it out and snap the harness on. The question is how exactly does the surround or dash kit come off? Is there screws or does it just snap off. Our old car was a ford it had those easy grabbing hook things! Any advice would be appreciated!
Thanks!

Instructions can be seen here.

http://documents.victorytechnologies.com//documents/product/9455.pdf

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