Nokia seem to have omitted that instruction from the manual, whether in English
http://tinyurl.com/hagkx7n
or Spanish
http://download-support.webapps.microsoft.com/ncss/PUBLIC/es_ES/webpdf/504815367495/Nokia_222_Dual_SIM_UG_es_ES.pdf
However it must be somewhere within the 'Settings' options, so I suggest pressing 'Menú', going to 'Ajustes' (= 'Settings'),seeking something relating to 'Idioma' (= 'Language') and then selecting 'Inglés'.
To change the language for predictive text you need to go via 'Opc.' (= 'Options') and 'Diccionario'.