[Maptitude] Joining my data to county

[Beatriz Woods]

I located 7,800+ records and they now have the latitude and longitude in the 
dataview.
I want to map these in a color theme based on county, ie, 6 members in this 
county is light green, 180 members in that county is darker green.
 
How do I join the two based on areas of latitude/longitude in my dataview with 
the County layer?
 
Thanks.