You can rename a blog entry at any time.
In the sidebar on the left of the iWeb window, click Entries (below the name of your blog), and then do one the following:
Double-click the entry in the Entries list at the top of the page, and then type a new name.
Double-click the title text on the entry page, and then type the new name.
The new name appears on your website the next time you publish.