Hello Territa,
If you have your wordpress installed on your account, it is already public. As long as someone types in the correct URL they will be able to see it.
If you have installed it under a subfolder and want to move it to the main to be more visible (shorter URL), you will need to migrate the files over. WordPress has written a couple of articles to help you do so.
http://codex.wordpress.org/Giving_WordPress_Its_Own_Directoryhttp://codex.wordpress.org/Moving_WordPress
Best Regards,
Scott M