Click "Channels."
Click "Add one."
Click "FPC." The FPC interface should appear.
Click the arrow in the upper left corner of the FPC interface.
Click "Presets."
Click the desired drum kit.
Open the FL Studio installation folder. The location varies based on the operating system and program version. Perform a file search if unsure of the location.
Open the "Data" folder.
Open the "Patches" folder.
Open the "Plugin presets" folder.
Open the "Generators" folder.
Open the "FPC" folder.
Place the new drum kit in the folder.
Click the arrow in the upper left corner of the FPC interface.
Click "Presets."
Choose the desired drum kit.