Use Case Diagram (PlantUML)

@startuml
skin rose

:Main Admin: as Admin
(Use the application) as (Use)

User -> (Start)
User --> (Use)

Admin ---> (Use)

note right of Admin : This is an example.

note right of (Use)
  A note can also
  be on several lines
end note

note "This note is connected to several objects." as N2
(Start) .. N2
N2 .. (Use)
@enduml