Can someone help me upgrade my Samsung Galaxy S5 from 4.4.4 to 5.0?

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AC Question

(Phone bought online)Can someone help me upgrade my galaxy s5 from 4.4.4 to 5.0?

So I'm just not sure exactly what to do guys. I was reading other forums. . I can post whatever u need to kno , so someone can help me. Keep in mind your talking to a 22 y.o female with not so much knowledge of this kinda stuff. Thanks !