Art Glass E-Commerce Website Development

I need some help with tweakings. I've created a site but on many of pages, there is boilerplate content/images below my images -- but going to Edit/Edit Section does not show that boilerplate as removable blocks. I also have some other issues -- adding arrows right & left to move through images -- and I want to be sure that my pages are reproducible via styles vs. just going in to each page to make adjustments tehre.