How do I get access to the developer team to fix a problem for me?

Part of the promotion from Appsumo was access to small wp jobs done by the wpmudev team.
I have a issue with my site that I'm stuck with right now that I'd like to get help with. Hopefully it's a quick fix or point in the right direction.
It's to do with getting rid of white space on a mobile page layout.
The page is