I can't undo jailbreak on iPhone 4S?

I have tried using iTunes and several other web programs.
All this doesn't help. I tried holding power and home key still no luck
Can someone please help I was using cydia.

Go to settings and restore it. The. Just to be sure restore it through itunes

You can't restore it in settings you will have to hook it to iTunes to unjailbreak it when you do it erases everything but that's the easiest way another way is that there's a software to unjsilbreak a phone but I don't know what it's called it's a b###h to find and takes awhile so I would just restore it if I was you

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