File to edit to change add form?

["Jan M. Bednarczuk" <bookworm@drizzle.com>]

Hi all,
I've been looking for the file that I need to edit to change the form that
people add their site information to (I want to reword it to stop people
from adding MY information instead of their own, as is apparently a common
problem).  I can't seem to locate it -- which file is this?
Thanks,
Jan