Try this. Go back to the main page of the extranet. If you expand on the second bullet in the sidebar

(ค้นหาและดูข้อมูล), it should show you this:

ค้นหาข้อมูลแจ้งรับคนต่างด้าวเข้าพัก(Search TM.30). Click on that, and fill in the same date for check-in and check-out, which is the date you filled in the TM30. That should pull up your most most recent entry.

There is a hotel/apartment across the road called Holiday Place (D'Villa) with a business center at the back of the lobby. They have printouts of the visa application form and checklist available for RM2 each. They also take passport photos and have a computer there for Internet access.