Not showing on the dropdown? – If it was saved from Endnote, then you will need to (the first time) choose “select another style” from the top of the styles dropdown on the endnote ribbon, or in the style dropdown in Endnote. Alternatively you can Edit>output styles and open the style manager, to view them, and tick and untick boxes for those you want to appear, or those you don’t want to appear in the ribbon/endnote dropdowns.