Tap [Import from Keplr Extension] from the options and follow the instructions. Make sure your Keplr Extension is ready for the next steps.

Tap [Next] and scan the QR code from your Keplr Extension. To display the QR code, go to Settings > General > Link Keplr Mobile in the Keplr Extension. Once completed, all accounts from your Keplr Extension will be imported to Keplr Mobile at once.