How to add/change joomla logo

Joomla gives builtin three template.Templates are belong inside xampp/htdocs/(joom package name)/templates.
They are beez,ja_purity,rhuk_milkyway.Here joomla use own logo.But if u edit the anyone template for displaying your
own logo.
    
       Step-01:Make your logo using photoshop or other graphics software.
Define the logo size carefully.copy the logo and paste in C:\xampp\htdocs\joomla1.5\templates\rhuk_milkyway\images
Here show that suppose you install xampp in C:\ drive. and joomla1.5 is package you install and rhuk_milkyway is
the template name.

       Step-02:Login to the joomla back-end.

       Step-03:Go to Extensions.Then go to Template Manager.Select a Default template.Click edit.
      
       Step-04:Edit css and you can see some css file to editable.

       Step-05:From here select template.css and find the logo which is used in "rhuk_milkyway"
and here write your logo name.
      
       Step-06: Save it and refresh your browser then see logo in your site.