use the rhapsody music download, that came with the sansa. Put a music CD into the disk drive, and hit rip disk on the rhapsody music download. YOU DO NOT NEED TO LOG IN, just hit X on the login screen, plug in your sansa e250 via the usb port, and just drag songs from "My Library" to "Sansa e250"
You select the song by clicking on it, and then press the delete key, or just right click on the song and select delete song. You can delete multiple songs by control clicking (by pressing control as you click to select multiple songs) and pressing delete.