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The slot for the MicroSD card is on the upper right side of the device; covered by a sliding shield you push aside gently with a fingernail. It's similar to the shield covering many cellphone power outlets. Actual insertion should be gently done (never force card) by placing the metallic stripes on the card inside, face down and completing with a small push. There is a manual on the Fire: Go to Settings, find Help, Search for "Insert and Manage MicroSD card" The manual has detailed illustrations and instructions on installation and use of the MicroSD card. The available memory is slightly less than the advertised memory; that's usually the case with memory cards for various reasons. One thing I was disappointed (well, two, if I count the lack of a tiny plastic case for the MicroSD card when it's not in the Kindle. This used to be almost standard) discovering I couldn't directly download my Kindle books or my Audible audio books directly to the card. For me, with the Fire's limited data storage and my 30Gb plus audiobook collection, this is a big drawback. The whole point of the MicroSD card was to enable me to store most of my audio books (or a great many) on the device for when Internet access was unavailable - which is often given my occupation and travel. I suspect though, I will be able to transfer via usb cable.