[Plugin: Leaflet Maps Marker] Unable to find how to put the map on the blog

The easiest way is to copy and past the shortcode of the map into the post or page where you want the map to appear.

Shortcode example for marker maps:
[mapsmarker marker="1"]

Shortcode example for layer maps:
[mapsmarker layer="1"]

If you already updated to v1.9 you can also use the tinymce button (see http://mapsmarker.com/v1.9 for details) to easily search and insert existing maps into posts or pages

There are also 2 tutorials on the mapsmarker.com:
How to add a marker to a post or page
How to add multiple markers (=layer map) to a post or page

BTW: If you like the plugin it would be great if you could vote for it on wordpress.org