Just visit
www.iberia.com and select the option "Grupo Iberia", by clicking on that option on the toolbar at the bottom you are forwarded into a new page where there is another toobar.
Once there click on "trabajar en Iberia", once again you move onto another page where there are several options at the top of it.
Firts one is "ofertas de empleo" (vacancies), you can visualize the current vacancies you can apply for airport by airport, second step is to create your profile by clicking on , oh god!!! I´ve just spotted this part of the web site is also translated into English, so just follow the different steps.
Once your CV is included in our data base, you will be contacted if vacancies are available and told when and where to go to.
The tests involved are just a personal interview and some phisical and health tests.
Hope it has helped you.
A good pro is to speak Spanish at a very good level
Best regards
Javier