Here, Robert is presented with the child selection screen. To assign a task to Joffrey he clicks on Joffrey's profile. 

This opens the To Do list for Joffrey:

Then to assign Joffrey a task, he picks one from the list:

And takes a before picture.

Then he exits the application.
Joffrey, upon opening the application, sees this:

And knowing that someone left something for him to do, he opens his To-Do list:

And to mark the task as completed, he opens the task and submits a completed picture:

This removes the red notification icon.