Visit your favorite record label's website. Scroll down the page to find the "Contacts" page. Click the word "Contacts" (or similar wording).
Locate the email address where you should send your demo. This may be marked as the talent scout or simply "send demos here."
Copy or write your email address into the "to" field.
Click "Attach," and choose your demo from the items in the drop-down menu. If your file is not in the immediate list, choose the location of your file from the drop menu (such as your desktop or "My Music") and select the file from the list. You may need to change the file extensions at the bottom of the drop-down menu to see mp3s saved on your computer. Click "Ok" once you locate your file. Wait for the file to attach.
Write a short message to accompany your demo. Explain who you are, your style, where you are from and a way for the record label to contact you. Click "Send" to send the email.