Hi
I run a letting agency and have set up online access for many of our clients. (currently have managed to set up 21) It is also proved to be invaluable to us as we can log in and get copies of bills and online estimates. The system has also just introduced e-statements. You can request that instead of posting the bills to you they email you and you can then print off a bill (which is in the same format as the postal statements). As we all know the post in Spain is not the most reliable so this service can be extremely useful.
You need the latest bill otherwise you will not be able to set this up.
Make sure empresa is Sevillana
The contrato number is the "contrato de Suministro no"
The no de la última factura is the "factura no" - this normally starts with a S
If you don't have a middle name put Don or Dona in the nombre box, then your first name in Apellido 1 and your surname in Apellido 2
If you dont have a spanish number I would advise you to just make one up! (as long as it starts with a 9 or 6 and is 9 digits long). You can then always email them later with your correct number and then it's up to them to correct it on their system.
The other problem I have sometimes come across is the Tipo de documento. You need to put the number in which is by the DNI/NIF on the bill. On my bill this is my NIF number however when I set up online access it didn't recognise this number as NIF/DNI. However I just changed it to "card" and it worked.
On a few occassions I have been unsuccessful in setting this up. Usually it is because it doesn't like the NIF/DNI - Card - Passport number. Unfortunately if you have tried 3 or 4 times and are sure you have the right information then there isn't much you can do. Sometimes its just a case of "computer says no"
However I have found that if you email them explaining that you have tried to set it up they normally reply (although it can take them a few weeks) with a username and password for you.
Hope this helps....good luck!