If you opened a Blipfolio on the old site, you can still access it by typing www.blipfoto.com/blipfolio into your browser's address bar, while you are logged in and viewing your journal (if you try to do this at any other time it will not work).
Alternatively you can access it using the following address www.blipfolio.com/<your_username>
This original Blipfolio URL will be retained, so if you shared it with other people in the past, they will still be be able to access it.
If you want to make changes to your Blipfolio you will have to use the first access method so you can see the edit menu. There you can add images or folders (up to a maximum of 15 images in up to 5 folders) just as you did before, using the icons on the bottom left hand corner of the screen.