If you want to register at Jung Min's official site, follow the steps below. I use Google Chrome so it's translated to English for me.
Credits to parkjungmin.net + yenhersheytriples.blogspot.com
1. After clicking the LOGIN at the right top of the page, select the link which corresponds to the word Register below.
2. Fill up the fields below.
3. For the dropdown list, here are the translations
4. This screen simply asks whether you want to proceed with the registration. Just click the OK button.
5. Click the OK button as well for this screen.