HTC One E8 - Manual (Page 201)

Tools and Calendar 188
4. Pull the microSD card tray out, and place the microSD card into the tray.
5. Insert the microSD card tray back into the slot.
6. Turn on the phone.
Remove the microSD Card
Here are the steps for removing the microSD card.
1. Turn off the phone.
2. Hold the phone face up.
3. Fully insert the tray eject pin (included in the box) into the small hole next to the microSD card
tray slot until the tray ejects.