The files don’t have fold lines in them so that you can crease the card where it needs to be. You can cut of the extra after you fit it to the card.
Now fit the band around your card. Make sure the band is a little loose. It has to slip off for your loved one to get it off the card. You can glue the band together in front or in back. Try both and see which you like.
Lastly, decorate the band. It can be simple or complex. Use your imagination. Use embellishments you have around the craft room or make something specific to your project.
Now your card will stay closed and you have elevated it to an even higher level.