welcome everybody
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Is it possible to add a link to share the site?
With the map and be active
Also, when you add an advertisement, you can only add the site, the country, the city, and the region
Why not choose directly from Google Map
Or add a location sharing entry box from Google Maps
When you click on it, it will go to Google Maps
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Is it possible to display all the entered items?
On a live google map, for example

@rooman
Is it possible to add a link to share the site?
Yes

Also, when you add an advertisement, you can only add the site, the country, the city, and the region
Why not choose directly from Google Map
Or add a location sharing entry box from Google Maps
When you click on it, it will go to Google Maps
Because osclass use custom locations structure

Is it possible to display all the entered items?
On a live google map, for example
You may check following plugins:
https://osclasspoint.com/osclass-plugins/extra-fields-and-other/openstreetmaps-osclass-plugin-i99
https://osclasspoint.com/osclass-plugins/extra-fields-and-other/radius-search-plugin-i53

What I understand is
The components must be used together
Radius Search Plugin
OpenStreetMaps Osclass Plugin
Or one component will do
I read the Epsilon Osclass Theme
The ingredient is added to it
Thanks

@rooman
Radius Search Plugin and OpenStreetMaps Osclass Plugin are optional plugins, personally I prefer more OpenstreetMaps as it has free API.