zte s302: how to remove the cover

[upup]

I got this ZTE S302 and wanted to remove the back cover in order to do a sim swop.

This phone is a gift to a friend who cannot see well.

here is a link with 200 videos, none showing how to swop sim.
I struggle to open the back cover.

http://www.sonymobilephones.com/zte-s302/unboxing/videos

 

[upup]

I took a knife and click the cover off. Still one big sim inside. Hope the person current sim will fit.