I did it using Custom legend as previously mentioned.
In 'preferences' then Radar Box you find custom legend.
Here you can write the name of the city followed by Lat on Lon.
Here is my example where i just use one letter for the city name.
U,50.9752,0.1097
E,50.77,0.28
B,50.822563,0.140457
H,50.865515,0.57787
M,52.1828,0.9938
Brian