Cannot get frontage to be editable in Upfront after Directory change

hi,
I have uploaded my WP site to a subdirectory called /wp/ to be able to redesign the current website before activating it. When I was done (without any trouble) I copied the htaccess and index.php file over to the root directory and change the index.php file to reflect the site directory. Now when I go to the root directory the website displays as it should. The problem I have now is that I seem to be able to edit pages through upfront, but not the main home page. It doesn't give me access to the editable version and simply displays the viewing version. The url in the top says : http://www.mydomain.com/?editmode=true
..but I can't edit it as the upfront is not displaying - it is simply shown as a normal webpage.
What can I do to rectify this please?