To access the Particle System Liibrary press F7 (or find it in the bottom bar) while in editor mode. Find a Particle System(PS) that you'd like to use.

-Create a new Particle System, name it whatever you'd like.
-Use the checkbox "Allow Overide this PS"
-Input the name of the Particle System EXACTLY as it's named in the PS Library.
-Keep in mind that in your code, you'll still be using the name of your original PS.

For example in this picture we would use

What I mean by the hard way is that we are going to "Copy and Paste" a PS in the PS Library into our own Particle System, allowing us to edit and make changes to the PS without overriding the original.

Step 1: Add the PS to the scene. Drag and drop from the PS Library into our scene.

This will automatically bring you into the Particle Editor Mode:


Step 2: We now need to Copy this PS into memory. Do this by pressing the Blue Up Arrow.


Step 3: Paste that particle system into our own PS. Go to Edit this PS:






























Paste our copied PS into this PS using the Red Down Arrow

Now you can edit this PS all you'd like.