There is no way to submit them automatically anymore. They could potentially contain sensitive information, so it's best not to post them without reviewing the content.
The textdump.tar files are the ones with the useful information. You can expand them with 7-zip or similar though you may have to rename them first (for example, rename textdump.tar.0 to textdump0.tar), and the most important files inside each are ddb.txt and msgbuf.txt.
ddb.txt contains the panic backtrace which may point toward a specific cause, while msgbuf.txt contains the kernel message buffer which may have additional clues if the backtrace alone isn't sufficient.
You can post the tar files here on the forum, or just the txt files, but review the content first to make sure you aren't posting anything identifiable that you aren't comfortable sharing with the world. For example in your screenshot it has your hostname.