I purchased, downloaded, and imported an extension. (chroma Key Kit)
Now I just have a folder with random things in it. How do I actually use the extension.
“I’m new and have only had unity for a week” and I have gooled/youtubed/reddited prior to posting
It all depends on the product. You should read their documentation (they usually have it on the creators website or within the collection of files you downloaded). Most tools are just a collection of assets and scripts. They often have custom menu items or specific components. It really depends, so best look up the plugins docs. There’s no general step to installing extensions or anything like that, other than downloading and importing into the project. 