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I'm going to assume you are using 2.0.X and not 2.2 because I can't answer that as it's changed quite a bit.
I must admit that the standard web page message after you register, which is:
Quote:
You are now registered. An email containing an user activation key has been sent to the email account you provided. Please follow the instructions in the mail to activate your account.
really isn't that confusing, especially as common a technique as it is on the web. However, you can change this message in the rootpath/language/english/user.php file. Look for the _US_YOURREGISTERED definition.
Easiest place to add info on the registration page would be to add something to the registration form as display only. This page doesn't use the usual smarty templates $xoopsTpl type of displaying. Find it at rootpath/include/registerform.php, but you'll need to learn about XOOPS forms and the likes, and this is a core file hack.
As for the No Permission, that's being called from the same user.php file. Look for the define of _US_NOPERMISS and change the message in there.
Finally, a more descriptive subject title is in order instead of "How can I....". Maybe something like "Add Header to Registration Page" or the likes. And tell people which version you are working on as each version has some changes.