Next, adhere the three squares in a line like this. I used Tear and Tape. You can also use Mono Multipurpose Liquid Glue.
I found it easier to fold in each side to the middle like this.
Once you've folded the keepsake, mark the top (ask me how I know). Add Tear and Tape across the front and the back. Adhere 12" of ribbon to each side.
Decorate the front and inside as desired.