Everyone has been writing blogs and asking on the BBs how to make a free website. None i have found are edit-compatable with the DSi, you have to edit them on a PC. The best site to make a Dsi-compatable website must be Vistapanel.net. You have to have a G-Mail account, you can't use msn, hotmail, live, yahoo, ymail, rocket mail and many more- it says that they have problems with those e-mail domains. You can use AOL to register but you can't activate your account, ive made hundreds of AOL accounts but the page is never found!
If you want to make a site which is to do with a buisness or browsing use webs.com. You can use any e-mail account for it and if it is your first ever website, use it. Its really easy but not that proffesinal as they spam you billions of e-mails.
If you are thinking of making a mobile site use Yola.com. Its baisically one web-page which is a good site-builder for browsing! Don't bothering in getting a domain name for your site, they are a waiste of money, all it is is changing something from like "http://example.webs.com/" to "http://example.com" so why bother. I hope this comes in handy!!!