1. Open iTunes.
2. Select the Music tab.
3. Click on Account > Authorizations > Authorize This Computer
4. Enter your Apple ID and password when prompted.
Transferring music from a computer to an iPhone/iPod/iPad:
1. Connect the device to the computer with the appropriate lightning/USB cable.
2. Select the device in the iTunes.
3. Select the Music tab.
4. Drag the songs you wish to transfer from the iTunes library on the left to the device section on the right
5. Check the Sync Music box and select the Apply button, ensuring the desired songs are checked
6. Eject the device when the transfer is completed
For transferring music with specific playlists:
1. Select the Playlist tab in the iTunes and choose the desired playlist.
2. Drag the playlist from the left side (under Playlists) to the device section on the right.
3. Check the Sync Music box and select the Apply button.