Navigate to WP Admin -> Avenue Theme -> Homepage Options and enter “featured” in the “Featured Posts Slider Tags” field. (You can also select tag of your choice instead of “featured”).
On the same page, make sure “Show Featured Slider” field is checked.
Edit posts which you want featured and add “featured” post tag to them.
Please note, if you have multiple tags or categories with the name “featured”, use the tag slug instead of tag name.
Make sure there is no category that is called “featured“, a category with same name as post tag selected for featured slider will conflict.
Make sure you have a featured post image in order for best results.