Confusion about sticky post slider

Great theme, Griden. It’s my favorite one I’ve ever used. I’m just a little confused about the sticky post slider. I’ve marked several of my posts as “sticky.”

I saw in another thread that, to be displayed on the slider, posts can’t be marked “standard.” The only other option I see is “Aside” – is that the correct choice to enable them to be placed on the slider? How could I enable a “Gallery” post?

I also don’t have a header image at the top of my posts. Rather, the images are in with the text. Could this be preventing me from seeing them in the slider? Here is my blog: https://worrisomewanderer.wordpress.com/

Finally, do I need to alter the CSS in anyway to make the slider work? Unfortunately, I don’t have the skill to do this.

An aside – why does the title of my blog appear below the Header image instead of above it, as in the template?

Thank you for any help you can offer.

-John