You can add the Todo Cloud Widget on iOS by doing the following:
- Swipe down from the Home screen, Lock screen, then swipe right from your Notification Centre.
- Scroll to the bottom and tap Edit.
- 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.
- To finish, tap Done.
Here's an illustration of the Todo Cloud Widget on iOS 10