Important update: According to Amnesty International, the information at the Spanish website is not correct and they do not recommend an email campaign at this time. If you wish to sign the petition just to put your name to opposing the sentence, feel free to do so, but Amnesty International will not be making use of the petition.
The Spanish branch of Amnesty International is organizing a campaign to save Amina Lawal, the Nigerian woman sentenced to be stoned to death for adultery. For background on why the sentence against Amina is contrary to Islamic law and ought to be revoked, see my entry Should Amina Lawal be put to death? Real Islamic law says NO.
You can sign a petition for Amina. The site is in Spanish, so here's a quick explanation of the form. The nombre field is for your first name. The apellidos field is for your last name. In the provincia field, enter your state or province, if appropriate. The pais field is for your country. If you're in the U.S., select Estados Unidos from the drop-down menu. After filling in these fields, click the button labeled seguir. The second page is pretty straightforward. Enter your email address in the field if you wish to receive updates, then click the aceptar button. If you don't wish to receive email notifications, you can leave the field blank and just click the aceptar button.
Thanks to reader Sabrina Aslam for notifying me of this by email.