If you're unable to edit the order, it may be because you're using an older version of the app. We recently made it possible to rearrange wishes, even if the wishlist contains more than 100 wishes, as there was previously a limit. Make sure to have the latest update before you can use this feature.
It's also important to note that after changing the order of the wishes, you need to scroll down to the bottom of the list and click "Save" to ensure that the changes are saved. If you close the window without saving, the new order will not be stored.