Updated for 7.0
On the left-hand side of the screen in the navigation bar, select Member(s) under Member. This will take you here:
At the top of the page, click the plus sign button under the Members bar. This will take you here:
Follow the prompts to add a new member and their information.
Click on each box and type in respective information
When done, click the + Add New User button located at the bottom of the page.