You should have ShareMe installed on both phones. Once done, launch the app simultaneously and you will see 2 options, select "Send" on the phone that you want to send a file from and select "Receive" on the receiving phone. For the phone that will be sending the file, after selecting the "Send" option, select the file/files that you want to send and it will show the camera app to scan the QR code for the receiving phone. On the receiving phone, select "Receive" and it will show the QR code which should be scanned by the sending phone. Once the scan is successful, wait for the transfer to complete.