How to loade music from my computer to my mp3

You don't need to say it 2 times.
Hooking up the device to a USB connection on your computer.
Going through the settings on your device to find a "USB CONNECT" or "USB MODE" option. Some devices do that automatically when they detect power on the USB cable, others (like the Sony PSP) require you to do it manually).
Your computer should now automatically detect the device, probably showing it as a removable hard disk. Both Macs and Windows XP computers do a very good job with this, older operting systems can be more challenging (e.g., Windows 98, MacOS 9).

Now you just need to rummage around a bit and figure out where music files should be stored. One way to do this is to pay for one song to be downloaded from a service, if that's an option, then see if you can find where it's stored on your MP3 device and drop other songs into the same place. If that's not an option, then just put a few songs in different directories and see if your device can find it once you disconnect and try to play a song or two.


Use windows Media Player also to Sync the songs then put on the mp3

In addition to what figment said, if you're on a PC, Media Monkey can sync with almost any mp3 player.