Hi,
Swipe down quick settings (here you can see wifi, location etc), tap 'edit' then you will see 'edit quick settings', scroll down to 'device' then click on 'applications', this will put a tick next to it. Once you are done you can swipe down to quick settings and find the circle with the apps on it for quick access.
Hope this helps, if this is not what you were looking for, please let me know