Can't access iWork for iCloud on iPad or iPhone
I am new to Macs and have just bought a 2nd hand Macbook pro. I want to use iWork for iCloud on all my devices (iPad, iPhone,Macbook and Win PC) I went to icloud.com on PC logged in with apple ID and it works fine, started Safari on the Macbook and did the same, all OK. Thought this was easy, very impressed. Now the problems start I opened Safari on iPad and typed icloud.com and it takes me to page with 3 options :-
1) Set up iCloud on this device. 2) Open Find my iPhone. 3)Open Find my friends. if I tap any of them it goes to a page instructing me how to do each of these things, the problem is I have already setup icloud on these devices and can access my docs, pics etc on iCloud drive but not iWork. My iPhone is the same. Does anyone know what is wrong please?
MacBook Pro, OS X El Capitan (10.11.2)