Installing Addon:

1. Download the addon as a .ZIP file

2. In Blender, go to Edit -> Preferences -> Add-ons -> Install, then click the .ZIP addon

3. Now that the addon is installed, open the N-Panel (by clicking"N"), then go to the "Quick Ref" tab and follow the instruction below on how to use the addon

How to Add a Reference/Background Image:

1. Find an image online

2. Right-click the image, then click "Copy image address"

3. In Blender, open the "Quick Ref" panel, paste the link (CTRL + V) in the "Image URL" input, and click "Add Image!" to add the reference photo