How does one get the left side of this bottom bracket unscrewed so i can can install it, it just keeps spinning what am i Doing wrong

Amazon.com : Miche Primato Track Bottom Bracket 68 x 107 English : Bottom Bike Brackets And Accessories : Sports & Outdoors

Update: well the right side came off by itself , it says fit the pre-assembled cartridge in the bottom bracket cage, inserting it from the right side. so that means i need to get the left side of the bracket off ?

nevermind I banged it lightly with a hammer and the thing separated thanks!
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