In your runtime palatte, click the symbol at the top (from anywhere) till you get to the list of runtime folders, which in your case will probably consist of two: Poser8 runtime and downloads. If you then look at the boittom of the palatte, you'll find a "+" sign. Click on that, and it'll ask you to add a runtime.

IMPORTANT: you have to be ONE LEVEL UP from the actual runtime folder. For example, if I have a runtime set up for a project called "Naked Vicky", I DONT click on the Runtime folder to add it. I click on "Naked Vicky". Also, ALWAYS MAKE SURE it's a runtime, complete with geometries and libraries and so on. Poser will reject it as an addition if it's not in proper runtime format.

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