The email subject Name:Top Deals for Mother's Day, one of the little deals will have a code to redeem for a $2 mp3 credit. Details below
1. Click the button below, enter the code you received in your Amazon Mom email, and click the "Apply" button. The code you received is unique and can only be used once.
2. If you received a confirmation that your code has been entered successfully, the dollar amount of your code is now in your account and will remain there until it has been applied towards eligible purchases or until it expires on May 31, 2012. If you receive an error entering your code, be sure to check that you've entered the code correctly and be sure that the promotion is still valid and has not expired. If you still receive an error, contact Customer Service via Amazon MP3 Support.
3. Browse for your favorite music at Amazon MP3, find the song, playlist or album you want, click the "Buy" button, and the dollar amount of your code will be automatically applied to your purchase.
4. If you have not used the full $2 value of the promotional code on your purchase, we will automatically apply the remaining balance of your code on each of your additional Amazon MP3 purchases until you have used its full value or until the code expires, whichever occurs first. You can check your code balance by clicking "Redeem Your Amazon.com Gift Card or Promotional Code and View Balance" button, visible on every MP3 detail page. You must redeem your credit by 11:59 pm PST on May 31, 2012. Limit of one promotional credit per customer.
5. After your purchase, you can confirm that your code was applied by checking your order confirmation, which will be sent to you by e-mail.
7. Additional Terms and Conditions apply.
This post needed clarification on "button below." The OP gave it later on another page. So here it is; I've also added it to the Wiki:
Couldn't find the "button" mentioned by OP to apply code. Later he posted the link to code application page that contains the button:
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