Complete Newbie - Missing Basic Concept

Hello - I almost can’t believe I’m posting this. I have read through all the help files, watched four training videos on Pluralsight plus countless YT videos. I’m absolutely not grasping something very basic!

I’m a long time full stack software developer (obviously the problem here), I apparently think very differently than you design folk! ;)

All I am trying to do is create a simple wireframe. I completely understand how to create from scratch all the way to a prototype, no issue there.

I’m “trying” to use a free wireframe “file” from the community. I “liked”, “bookmarked” brought into Figma etc. but no matter what I do, I can’t get it, or any of it’s assets/components to show up in my project file under assets so I can use them in my fresh design file. 

I have been screwing with this for three days and I’m am completely ready to jump out my window! I have never ran into a technical problem I couldn’t figure out! This one has me.

What extremely obvious and basic concept am I totally missing?

Is there a YT channel that is good at Figma Basics?

Thank you, I know how this sounds, but I’m at a complete wall and I haven’t even started!