Connect to a 3G or Wi-Fi. Connecting to a 3G data source happens automatically on 3G-capable Kindles unless you've manually enable airplane mode. To disable this mode, select "Home | Menu | Settings | [Airplane Mode] Turn Off." To connect to a Wi-Fi network, select "Home | Menu | Settings | Wi-Fi Networks" and choose the applicable wireless network. If the network is secured, you are prompted to enter the passphrase.
Select an e-book from your Kindle's Home screen. The e-book automatically opens at its last viewing location on that device. If you backtracked in the book or read further on another device, the opening position will not be the furthest page read.
Press the "Menu" button and select "Sync to Furthest Page Read." Wait for your Kindle to communicate with the Amazon server.
Click "OK" to return to the last page read or "Cancel" to stay at your current location. If you are already at the last page read, a notice to that effect appears; click "Close."