You probably already know this by now, since your question is 7 months old, but if not, FIRST - make sure the keyboard case is fully charged, using the charging cable that came with the Kindle Fire HD 10. Then refer to the instructions that came with the keyboard/case. If no instructions available, first insert the tablet into the case and extend it open. On the tablet, go to "Settings" and select Wireless>Bluetooth. Turn Bluetooth on and select "Pair a Bluetooth Device." Choose "Fire HD 10 Keyboard." Once pairing is complete, open "Settings" and select "Keyboard & Language". Under Physical Keyboard select "Fire HD 10 Keyboard>Set Up Keyboard Layouts>English (US)". When complete, hit the BACK arrow to return to "Settings". That's it - good luck!