Take the plastic back cover off by either using a plastic Pry tool or simply using your hands. Start from the bottom by the charging port
Remove any installed SIM card and memory microSD cards.
Push the SIM card into the phone, and the spring eject mechanism should release the card.
The microSD memory card(s) may not have an eject mechanism. If so, they must be removed carefully by pushing on the raised edge/bump that is built onto the card. Use your fingernail or a plastic or rubber tool, but not one that will scratch and damage the delicate card.