Once the eiruv foods are designated, the proper method of arranging the eiruv is as follows: A brochah is recited, followed by a text stating that through this eiruv it will be permissible to cook, bake, insulate foods, light candles and perform any necessary preparations on Yom Tov for Shabbos. If one is arranging the eiruv on behalf of others, he must say so. According to some opinions, the text should also state that the eiruv will allow for carrying into the reshus harabim. The text may be recited in any language, as long as it is understood by the one who is reciting it.
[שו"ע תקכז, יא-יב, ומשנ"ב לז-מ; ביאורים ומוספים דרשו, 48 ,וראה שם, 49]