If your model is named “users”, then you’ll find there’s two files
that render the “new” page for your users table:
When you render the “new” page of your application, the _form.rhtml
content is “embedded within” the new.rhtml content. Check both of
those files out, and it should become clear how they tie together.
You can change the content of either or both of these two files, and
it will alter the appearance of your “new” page. Also, you can change
the public/stylesheets/scaffold.css file to influence how your “new”
page gets rendered.
By the way, the _form.rhtml file is also used in the “update” page of
your application, so if you change it bear in mind that your changes
will appear on both of those screens.
If you work through one of the free Rails tutorials on the Web, all
this will probably become clearer. “Rolling with Ruby on Rails” is
the best one I found when I was starting out, but there’s now plenty
of others around as well.