Create Instant Decal
Decals are created from the Decal Creation panel.
All four Decal types can be created without leaving Blender.
The created Decals will be added to a temporary libary called Instant. It's meant to be a temporary holding place, to collect decals and experiment with various settings.
Selection
One or multipe non-decal objects, depending on the decal type.
Nothing at all for info decals from images or text.
Add Decal to Library
Use this tool to add an Instant Decal, or any other existing Decal to any unlocked library of your choosing.
Selection
One or multiple Decals.
Keep in mind
Add Panel Decals to libararies marked as Panel in the preferences, if you want their materials to be accessible by the Adjust and Slice/GPanel/EPanel tools.