How do I install shelves here?

[samuellai2]

I have a display cabinet with these channels (not sure what they're called) pre-installed. I've been looking to swap the pictured metal shelves for a longer and more traditional wooden shelf. Does anybody know how to do that?

 

[Doghouse Riley]

Hi and welcome.

We need to see the whole unit and some less closer detail.
What is behind the fabric we can see?