4
I can only answer for XOOPS 2.2.3
The easiest way would be to add stuff to the top of the screen. E.g. a heading and/or the introductory text which you suggest.
The file you need to amend is modules/profile/register.php
At the very end you'll see
le="color: #000000"><?php case 'register': default: //INSERT STUFF HERE include_once 'include/forms.php'; $reg_form =& getRegisterForm($newuser); $reg_form->display(); break; } include XOOPS_ROOT_PATH.'/footer.php'; ?>
Add your stuff after the line where I've put (imaginatively enough) INSERT STUFF HERE.
If you know PHP and HTML, the rest is a doddle (and the next bit will be too simple for you)

All the PHP you'd need is to insert your HTML between
le="color: #000000"><?php echo <<<ENDOFTEXT ENDOFTEXT;
With the HTML, it might look like:
le="color: #000000"><?php echo <<<ENDOFTEXT <h1>Register for this site</h1> <p>Thank you for your interest in the site etc etc. <p><font color="red">Your registration will be approved within 24 hours</font> ENDOFTEXT;
I hope I've understood your question!!
EDIT: The ENDOFTEXT; shouldn't be indented, I think.