Your Nokia Device supports memory card hot swap function so you do not need to power off the device when inserting or replacing memorycard.
1. To prevent the battery from coming loose, place the device so that the back cover is facing up.2. Open the back cover3. When device display is facing downwards, on the lower right hand corner there is a memory card reader4. Move the metallic locking mechanism carefully to left and lift it to open the mechanism.5. Slide your MicroSD card to the metallic locking mechanism6. Fasten the lock by pushing it down and moving it carefully to right until it locks7. Replace the back cover