Use Case Diagram

{plantuml}
: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\nto several objects." as N2
(Start) .. N2
N2 .. (Use)
{plantuml}