You may have selected the option to review entries before posting. If this is the case, you will need to first approve any submission before it is posted to your guestbook.

To approve a submission to your guestbook, click "Approve Submissions" at:
http://au.geocities.yahoo.com/gb/

Select either to add a submission to your guestbook or delete it entirely, then click the Finished button.

Note: If the link to "Approve Submissions" does not show up, you may have not selected this option when you setup your guestbook. To select this option, click "Guestbook Setup" at: http://au.geocities.yahoo.com/gb/

Scroll down the page to "Step 8: Options." And check the box to "Review entries before posting."