Updated stock ROM with 10/25 security update

so i think this is what i need to put on my phone, but how do I actually install this on my phone? i have spent soooo many hours trying to figure this out and now im finally trying to ask questions. my husband rooted my phone, and I tried to put it back and my phone will only show an error message. basically what im asking is a way to tell how to put it back to stock and unroot my phone, but i dont understand the terminology at all! =[ like i said, i did not want a rooted phone because i dont know enough to even troubleshoot and my husband is now gone for the next month. please help! =[

yup, read through it already, I've been reading through it for days. Im hoping that I can find someone who knows a link to a forum that will actually help me, im sure that this has happened to someone before.

so i actually need my husband, who has all the information on that? hope he actually contacts me soon then and i'll get the info. thanks, my husband told me it was easy to put back but i guess its not as easy as i thought!