You need:

one key ring

cute charm or fun green Twinklet

Pink snap hook

Paper Punch

Pretty ID card necklace - optional

Picture says thousand words !!! punch the cards with paper punch and insert them in key ring.

NOTE : 

• Do not punch holes by mistake on the corners that has bar code (back-side of the card)
• Insert the cards facing same direction -  front side up - bar code side down