Customizing Fixer theme, icons, page builder funkiness and more

So I started using Fixer with the front end development and the brief pdf tutorial, but immediately ran in to some problems. I wanted to edit the slider, but at a certain point, the slides within the builder were unseeable, as if you needed to scroll down within the popup, but you can't. Then the slider would sometimes work and sometimes disappear. In addition, I'd love to use my own glyphs or icons in lieu of the 18 or so that come with the theme. Is it possible to do that? And is there a forum for support on this theme? I love the look of it, but need more guidance.