Short answers, pulled from the story.
Grand Admiral Karl Dönitz was named successor to the presidency and Supreme Commander of the Armed Forces in Adolf Hitler's political testament. Joseph Goebbels was designated Chancellor but committed suicide the following day before assuming office.
The administration moved to the Mürwik Naval School near Flensburg on the 3rd of May 1945 with administrative offices established on the liner Patria moored in Flensburg harbour. This location sat near the Danish border while residual ministers from the previous cabinet fled Berlin to join him at Plön.
British troops entered the sports school in Flensburg-Mürwik at 10:00 am the 23rd of May 1945 during Operation Blackout. By 11:30 am, 5,000 German prisoners had been taken including Dönitz who were subsequently transferred to US-led Camp Ashcan for trial.
The station used medium wave frequency 1330 kHz to feature announcements from prominent government members until British censorship shut it down on the 13th of May. Listenership remained limited due to low transmission power and failed radio power supplies while broadcasts reached declining German Reich with better quality in northern Germany.
The Berlin Declaration signed on the 5th of June 1945 gave legal recognition to the state of affairs existing from the 23rd of May at latest. It stated that Germany did not possess native government and complete authority was assumed by Allied Military Occupation Government.