I'm using Samsung Galaxy S4 on Android 5.1 Lollipop. I found Google Now in settings and I decided to check what is it. Now settings interface has changed and I don't know how can I replace Google Now back to TouchWiz.
If you're on 5.1, it could be: System Settings --> Default Applications --> Home. Select touchwiz and press the home key. Hope this helps.
Uh, I'm not entirely sure what the question is so just tell me if I'm wrong. If you pull up Google Now launcher under the apps section of settings there should be a button titled "clear defaults." If you select this it should ask you which launcher you want to use next time you close an app. You can also install a different launcher and the same thing will happen but the other way should be easier.
I had this issue, open up Google Play, search for Google Now Launcher, select uninstall and it will revert back to Touchwiz interface