You can add the Todo Cloud Widget on iOS by doing the following: 

1. Ensure you've first installed the latest version of Todo Cloud from the App Store.
2. Swipe down from the Home screen, Lock screen, then swipe right from your Notification Centre.
3. Scroll to the bottom and tap Edit.
4. Tap beside Todo Cloud to enable it, you can the reorder it by tapping and holding  next to it and drag it in the order you want.
5. To finish, tap Done.