Login your QB account and go to a dashboard page and select Home Work.
If you already haven't created your homework, then click on the Add Home Work( green button) on the top navigation bar, as shown in the image below.
You have to enter the date that you are assigning the homework at the tab " Assign date". You can also mention the due date to complete the given homework at the tab "last date." Add your homework in the description box in a detailed way as shown in the below image.
You can even attach your homework in the form of Image/pdf files as shown in the below picture.