First step, you'll want to make sure that you're logged into Admin App.
Clicking your Profile Icon will bring up the app list.
Select "Switch to Admin App" if you're not already logged into the Admin App.
Next step will be selecting the Users Tab.
Users Tab will be on the left hand side of the screen.
Now that you're under the Users Tab, click on the "New" button.
This will be a green button on the top right hand on the browser.
Following that step, you'll need to fill out the "New User" information.
You'll be able to add all the information you need on this page.
Adding the User's Role will determine in they are a student or staff member.