How do I mount a Magellan Roadmate GPS System?

I am trying to either attach the GPS unit to the dash board or to the Windshield but neither are working.
The suction mount (blue part) goes to the window but how do you get it to stick/stay. When I clamp down on the lever it does not secure.
When I try to use the adhesive on the dash, does the mounted blue part discussed above come off somehow?

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