From the navigation menu, click on 'Admin Console'

Click on the 'Staff' Tab

Click on a staff member's name to open their profile

Go to the Access Tab

Choose any product you want to configure access to and click on the 'Pencil' icon on the far right of the screen

Make any changes you need, then click on 'Apply'.

Once you have configured the permission levels, scroll to the top and click on 'Save'.