Hello, I need to know how to enable the user to select the address by clicking the mouse on the map and thus defining the location of the pin.

Because of the way that you are setting the address from the address information of the form, the pin often stays in a different place than the original address. Ex: The Address is in the middle of the street and the Map Pin is at the Start of the Street. I want the User to click and define the place of the pin on the map. On the Ad Posting Page and Profile Page

thank you.

You can use our radius search plugin, but this feature will not work correctly with veronika (country, region and city must be input)
 I recommend to check it on google or google dev site

Right, I bought the Zara theme. If I buy this plugin you said, is it possible to do what I said?

You can test it on plugins.abprofitrade.eu
As zara use dropdowns for location, it may not work correctly.