Designville - Business & Portfolio WordPress Theme

when I add new pages they don’t always appear on the homepage & sub-pages aren’t showing up either. Also I need to figure out how the slider works, it just pulls up random pictures, I don’t understand the rhyme & reason behind it. I want to have pics in the slider as well as text to prevent the “stretching” of the pictures in the slider.

I can’t seem to find the portfolio items tab to set up my individual portfolio projects. How do I do so? I feel like this is so simple and I’m over thinking this.