How do I draw a 50 mile radius around a point I map?

This is possible using the paid version. There is a toolbar that appears in the upper left hand corner, this is part of the "Advanced Tools." One of the options is a selection tool that defaults to a rectangle. Change it to a Circle by hovering over the icon and selecting the 2nd option. Once Circle tool is selected, you can draw a buffer on the map. Change from miles / kilometers by changing the selection of the ruler tool.