1. Remove the SIM holder
Find the opener for the SIM holder. The opener is attached to the cover containing the papers that come with your phone.
Insert the opener into the small hole in the SIM holder.
Remove the SIM holder from your phone.
2. Insert SIM
Turn your SIM so the angled corner of the SIM matches the angled corner of the SIM holder.
Slide the SIM holder into your phone.