From RemyWiki

[edit] How To Create

• Click on the Original Course Creation link on the main menu.
• Pick a style and a play setting (Single / Double)
• Select the five songs and difficulties for each one.
• Confirm the five difficulties and give the course a name.

[edit] How To Play

Go to Course Session mode, pick the appropriate style, and click "Original" to get a list of the original courses for that style. Enter scores as normal.

[edit] Course Creation Limitations

You can only create one course every 30 days. If your course gets immensely popular, you can request an exemption by mailing Remy; if it's deemed suitably popular, it will be put on a generic account and you will get your course slot back.