From the main menu click on Units and choose All Units.
It displays all units categorized under various columns
By clicking on the button, you will be able to Edit or Delete the unit
By hitting the Edit button, it will display a pop-up that allows you to create edit fields and to update info regarding the unit.
Similarly by hitting on the Delete button throws a popup to reconfirm the Deletion.
Then click on yes, it will delete the particular unit from the unit set