Amigo: Click the small picture that says DOWNLOAD, on the row that "Love Of My Life" from Spain is on, or if this helps, click this link: http://www.7digital.com/shops/basket.aspx?shop=14&sid=69047&tid=105270
Then click CONTINUE, to a page where you will (in your case) register as a new user for the service providing the download.
Enter your e-mail address in the e-mail bar, and make sure "I am a new customer" is selected. After you enter your e-mail address, and click Continue, you will be asked to create a password.
Once you've registered and created your password, you will be directed to a page where you enter your credit card information and name.
You will be asked to enter the following information:
Name (as it appears on your credit card)
E-mail (should be entered automatically - this is what you need to get the download link(s) after you purchase the song(s))
Postal Code (pretty self explanatory, I think - dunno if it applies to Spain, but I think it does)
Card number (the numbers on the card obviously - no explanation needed)
Start date (Month / Year) / End date (Month / Year) - I think you'll easily figure this out
Validation number - as it says on the website, the 3-digit number on the back of the card, near where the signature is
Since downloads from 7Digital can be legally downloaded up to three times, could you e-mail me the download link(s) at firstname.lastname@example.org if you decide to buy this? Thanks in advance.
P.S. Mi español es no muy buen :P