Lab 1a

Hi, I have completed until step 94 of Max Lab 1a. However, When I try step 95, the "select fields of display" button is not clickable and the rest of the buttons are not clickable on the drop down menu as well. So I left my lab there and logged back in 4 days later. Now, when I look at the lab I can't see where I left off and also all my created leads have dissappeared and now there are new leads. What can I do to solve this problem and start Max Lab 1a from where I left off.