Next assemble the acorn embellishment on the front. Glue it to the front overlay. Do not attach it to the front of the card yet.
Then attach the overlays to the inside of the base card. And next, attach the embellishments to the inside of the card. Fold the card at the score lines and close it. This can be complicated but everything should fit inside the card and not hang out.
Finally close the card and glue the front overlay on the card. Be careful only to place glue on the part of the card that stays in the front and isn’t folded in. This is basically the outer edge. See the hash marks in the picture below. If you glue it to the folded pieces, the card won’t open.