Place cover boards on paper then place the binder board. Glue or tape down as shown in picture. Then score the fold lines along the top, bottom and both sides. Adhere the top and bottom first then the sides. The outside is done.
If you want to add ribbon to tie the book closed do so now on the inside cover boards. Then add your inside liner.
Run your finger along the joints and press the liner into the adhesive. Be sure to get a good fit around the binder board. If using glue let it set up.
Score around the joints and fold book closed.