How to modify welcome page after registration?

[محروم.كوم]

Hi

How do I modify the welcome page which a user see after registration. I wish to put a guidline for a new user for forum usage? The text which I wish to modify is


QUOTE"
Thank you, XXXXXX. Your registration is now complete.

You may now proceed to edit your Profile in order to fill in additional personal details about yourself, or you could modify your Options to customize your browsing experience of this site. If you would rather do these things later, you can do so by following the links around the site to your User Control Panel.
" Unquote

I have tried to serach in phrase but of no avail? __DEFINE_LIKE_SHARE__