I applied for a UX job, and I got a task to complete to show my skills... I got a task to redesign one screen of their app, and they didn't give me any user researches, personas, user scenarios...nothing, just access to their web app, and the job to redesign one certain screen.
They are very established company, and their business is about that app, so by not providing me any details for doing successful UX job probably was intentional. They told me to provide them only a final wireframe and the process (why I did it that way).
My question is what approach should I use and what to do about the lack of info? I don't want to send them emails asking for information, but I am not sure how to do it successfuly without it?