There will be a different page for those registering for the Koma Ladder contests.
If you are an international competitor, there is no registration fee. If you are Japanese competitor there will be a registration fee to be paid later.
Japanese players who participated in the 2023 Online Contest, as well as all international players, will qualify directly to the finals on the 24th. Other players might have to compete in a qualifying round on the 23rd.
You should upload the freestyle music on this page: https://spintops.org/uploadmusic/