Hi and welcome
Not quite sure what you mean.
If you have removed the "settings" icon from your home screen thats no problem. Go to the app drawer, find he icon and long press and drop it back to your home screen. You can also get to settings by (at the home screen) pressing menu then system settings gets you there.
If you are reffering to some other settings, then please post again giving more details of the app concerned, your model of phone, version of android and anything else relevant.