Inside your USER| LMMS| Presets
Create a folder and name it something like ownZASFX_presets
That will make a structured collection for your new presets
-actually saving is the same as for all LMMS-presets
Click the save-icon
Browse to you new folder
Type in a descriptive preset name
Click save-button.
The new preset will appear inside myPresets and can be both used in any project, and be searched with LMMS-token search