The Help queue is supposed to make it easier for you, as a teacher, to see which students need help with the assignment they're working on.
You can find the help queue in the top right corner under the Assignment tab.
When students need help, you will see a red circle with a number inside it over the person holding their hand up. The number shows how many students need help. If you click on it, you'll see which students need help and what assignment and problem they're working on.
If you click Show, you'll be taken to the problem the student is working on, and you'll be able to see the solutions and/or answers the student has turned in so far.
This is what it looks like for the student when they ask for help:
