how to delete this account?

Just reinstall it, not worth the trouble. Also, iWeb is kind of lower class to say the least. Good for people trying to make a quick page, but WYSIWYG editors like Dreamweaver will do a better job, and they are less prone to problems.

Or alternatively you can install a small CMS like cushyCMS and mod from there. I'd highly recommend a WordPress install on your server to do what you want it to

lol...i was using it this week...you have to select the stuff to ungrey the boxes...even still some wont ungrey, it's too limited...