Hi,
It is not clear to me what you want to tell.
Are you in library, schematic or board?
I assume schematic. But then.. don't you find the part when you use the "add" command? Or in the schematic?
Maybe a screenshot could help.
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Before you can "add" a device into your schematic you need to select wich libraries to "use".
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In "board" sometimes it happens that one "mirrors" a part to the bottom side. Then it may be invisible and not selectable.
To make it visible enable the layers "bottom", "bplace", "bnames", "bvalues" .
To make it selectable you need to enable the layer "borigins".
Hope this helps
Klaus