What is the Register?
Is the record of people living in Spain and their respective homes. It must enlist all the people living in the municipality, whether domestic or foreign, in this case, regardless of whether or not regularized their stay in the country.

To obtain registration is required a lease of minimum 6 months. All persons registered in the Register of a municipality are listed as neighbors of this and are entitled to public healthcare.

Where to go?
You can go to the Service for Immigrants, Foreigners and Refugees (SAIER) on Avenida Paral.lel, 202, subway L3 "Plaza España”. Here they will provide you the information needed to register and where and a document stating the date of hearing.

http://w3.bcn.es/V61/Home/V61HomeLinkPl/0,2687,200713899_200727207_2,00.html