How can I use an SD Card?

Insert an SD card into the switched off device > Turn the device on > Tap notification to Set up your SD card > Either choose to Use as portable storage if you want to be able to remove the SD card from the device or Use as internal storage which will enable you to install applications to it

Please note that the latter option will format the SD card, removing any data from it and will need to be formatted again before it can be used outside of the device.