Grasscutter.
I suspect that you're not entering the latitude and longitude in DECIMAL.
In Google Earth, go to Tools...Options and on the left-hand side, under "Show Lat/Long", click on the Decimal Degrees option. Then get the lat/long of the location you want, and enter that in the RadarBox dialogue box. Make sure you type the commas between the parts of the entry: name,lat,long
Best to make sure there aren't any blank lines above or below your entry, too.
It doesn't matter whether you click the "Draw Home Location Legend" option. Custom Legends show anyway as long as Map...Custom Legend is ticked.
Good luck
Rod