Adding Map Problems

I have installed and activated the plugin of Geo mashup. However, i do not really know how to make a post with a google map showing.

What i have done so far is that i create a page with the following code:

<!--GeoMashup-->
<!--GeoPost-->


And then i create a post and contain the following code
<body<?php GeoMashup::body_attribute(); ?>>

<div id="geoPost">
<!--GeoPost-->
<?php GeoMashup::post_coordinates() ?>
<?php GeoMashup::the_map() ?>
</div>

Actually I do not know what i am doing, i just follow the instructions from this http://dev.wp-plugins.org/wiki/GeoMashup and i am not sure if i understand the procedures.

Would anyone advices me the procedures on creating a page?
Thank you.