I can't seem to connect to the Internet on my new Sony Ericsson Satio?

I have bought an unlocked Satio, My O2 Sim works fine however when i try to connect to the internet it is giving me 2 options..... Vodafone or Yahoo Ireland

Does anyone know how i can set iy up to access the internet, i have had a browse through the settings menu but can't seem to figure it out
 
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