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Hi, you have to go to the pinmapple site:
https://www.pinmapple.com/
Then navigate to the location you want to tag your post to
Then hit the 'get my code' button at the top left
Then drop a pin on the map where you want the code for
Then copy the code that is displayed at the bottom of the screen
Then go back to your post and drop that code into it. It does not show up in your post. I just always drop it in as the last thing on my posts.
Give it a try - I hope that helps !!