If you are the network admin, you will have a red [Admin] tab in the upper right corner of your screen.  see screenshot - https://simon.d.pr/1Y9HlR

When you click on the [Admin] tab, you will see an "Edit Network Settings" link on the upper left side of your screen - see screenshot - https://simon.d.pr/eDEjT2

Click on the "Edit Network Settings" link and you will find the [Units] tab.  Click on the [Units] tab and you will see the "Edit" and "Delete" links beside
each unit listed.  You will also find the "Add Assistance Unit" link that allows you to enter a new unit.  see screenshot - https://simon.d.pr/NyQ4xO

Make your adjustments and click [Save Changes], and you're all set.