If you wish to prevent anyone but you from editing your dashboard, you can do so in the Document Distribution Properties window. This applies to other Prism Desktop users only, as users of Prism Viewer cannot edit dashboards at all.
To bring up the Document Distribution Properties window, navigate to File->Distribution Properties:

Make sure that the Locked option is marked and click OK.

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Distribution properties are saved in the PSM file itself, therefore you must save your document in order for your changes to take affect.
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