Dell Inspiron 14 5409 Service Manual page 23

Steps
1. Lift the mylar to find the memory-module slot.
2. Align the notch on the memory module with the tab on the memory-module slot.
3. Slide the memory module firmly into the slot at an angle.
4. Press the memory module down until it clicks into place.
NOTE: If you do not hear the click, remove the memory module and reinstall it.
Next steps
1. Install the base cover.
2. Follow the procedure in After working inside your computer.
Removing and installing components 23