What is the version of SiteAssist Pro you are using and what OS and DW version are you working with?
Please post back with this info and also the specific steps you are taking that give you this result.
When you edit the structure of the site from within the wizard it should create the pages in the site based on what you have entered here including renaming of the pages. You should not need to do any updating after the fact to get the pages linked up correctly.