It’s hard to fully help with the info given. It would be useful to:
know who makes Blank 5.1?
have a link to your website using Blank
I’m also not sure why you’ve chosen the blank theme. Probably for very good reasons, but you might want to also consider a free framework: Source. You won’t face this same problem, and there’s lots of support/tutorials for it. More here:
There’s still a learning curve, but depending on your needs & purposes for rebuilding your site it may be a better option. Hard to know right now.