(NOTE: Sample cannot be used as an EFFECT VST) Serato Sample will appear within both the NEW and VST instrument clusters and highlighted in yellow. Your Plugin database will appear in the left hand panel of your project window.
When the scan is complete any new plug ins will appear highlighted in YELLOW. Your list of existing Plug-Ins will appear on the right hand side of this window. Screenshots in this guide are using the latest current iteration at time of writing, of FL Studio 12.