THEME_DIR = WordPress ROOT/wp-content/themes/YOUR_DEFAULT_THEME

1. GO TO - "THEME_DIR/custom" using an FTP client.

2. COPY "scss" folder to "THEME_DIR/custom"

3. OPEN - "custom.scss" file from "THEME_DIR/custom/scss" directory.
   (If it doesn't exist, create one on "THEME_DIR/custom/scss/" directory.)

4. ADD -  
	@import "dependencies";
   on top op "custom.scss" file IF ALREADY DOESN'T EXIST.

5. ADD -  
	@import "semantic_ui_buttons";
   on "custom.scss" file under @import "dependencies";
6. LOGIN - to your website admin -> GO TO Gantry Admin -> Recompile CSS.

7. GO TO - https://semantic-ui.com/elements/button.html
   See buttons demo and its CSS class for using buttons.