a 403 HTTP status error indicates that the request was understood, but will not fullfill the request because the requested asset is ‘forbidden’.
This is most likely an issue with your .htaccess file, or a permissions issue within your wordpress installation. Try to delete the .htaccess file that is in your root folder. Then, log in to your wordpress dashboard, go to Settings -> Permalinks, and then just simply click Save Changes. This will generate a new .htaccess for your wordpress installation.