I found the answer. In the dock of icons in the top left corner of the OctoPkg page, click on the far left icon (the one with the arrows going in opposite directions). Put the cursor on the icon and it'll show "Sync Database". Click on it and wait for it to show the list of packages.

Hi. When I launch Octopkg, the list of packages doesn't appear. How do I get the list to appear? Thanks.