My own style does not appear

[Cypher-kun]

Hello guys. Really glad to be here
I'm new to the Sehcha Touch.

I'm following this guide: Theming Sencha Touch to start in theming.
For now I have installed Ruby, Compass and can compile my own CSS-files from SCSS-file.
I can see the changes in my compiled CSS-file doing them in SCSS-file. Everything works fine.

But application is still taking the original CSS-file instead of my.
I think I need to specify an application to get my CSS-file.
Tell my please where I can do it?

UPD: I wonder... maybe this guide is out of date?
I found a folder named SCSS in RESOURCES-folder.
It contains everything I need: config.rb and app.scss.
I can overwrite original app.css by compiling SCSS-file in this folder.
Is this correct way of theming?