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Why i can't see the sub menu 'UTF-8 Database Converter'?

If you are not the 'blog owner' or a user with level 10 (the maximum level), you cannot access this plugin. Because this task is a little complex and exceeds the normal user daily tasks, i have decided to make only visible and accessibly for the user with level 10 which is normally the blog owner or the blog administrator.

What are the System Recommendations or do i need something else?

I make this plugin compatible with the next minimum requirements:
* PHP >= 4.2
* MySQL >= 4.1.2
So it will no require anything different or anything special to work.

Can i delete it after the task is done?

Of course, once its make his job you no longer need use or have anymore this plugin in your plugin activated/stored list.